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HomeMy WebLinkAbout05.29.25 Board Correspondence - FW_ Environmental and Recreational Compliance Report submitted in FERC P-2107-000 by Pacific Gas and Electric CompanyFrom:Clerk of the Board To:Clerk of the Board; Connelly, Bill; Cook, Holly; Cook, Robin; Durfee, Peter; Jessee, Meegan; Kimmelshue, Tod; Kitts, Melissa; Lee, Lewis; Little, Melissa; Pickett, Andy; Ritter, Tami; Stephens, Brad J.; Sweeney, Kathleen; Teeter, Doug; Zepeda, Elizabeth; Loeser, Kamie Cc:Nuzum, Danielle Subject:Board Correspondence - FW: Environmental and Recreational Compliance Report submitted in FERC P-2107-000 by Pacific Gas and Electric Company Date:Thursday, May 29, 2025 4:54:13 PM Please see Board Correspondence - -----Original Message----- From: 'FERC eSubscription' <eSubscription@ferc.gov> Sent: Thursday, May 29, 2025 9:46 AM Subject: Environmental and Recreational Compliance Report submitted in FERC P-2107-000 by Pacific Gas and Electric Company .ATTENTION: This message originated from outside Butte County. Please exercise judgment before opening attachments, clicking on links, or replying.. On 5/29/2025, the following Filing was submitted to the Federal Energy Regulatory Commission (FERC), Washington D.C.: Filer: Pacific Gas and Electric Company Docket(s): P-2107-000 Lead Applicant: Pacific Gas and Electric Company Filing Type: Environmental and Recreational Compliance Report Description: Pacific Gas and Electric Company submits 2024 Amphibian Monitoring Report re the Poe Hydroelectric Project under P-2107. To view the document for this Filing, click here https://urldefense.com/v3/__https://elibrary.ferc.gov/eLibrary/filelist?accession_num=20250529- 5106__;!!KNMwiTCp4spf!DxzRXyfU8ru8kgI6CC0O2Wn_s_P9KGqsBgmullpBdBQBMb7E8EaH8OavxryWAM8oP8i3HnJ52uFn1G6erCZ3h4q3vi_n9uA5vaaW$ To modify your subscriptions, click here: ------------------------------------------------------------------------ Please do not respond to this email. Online help is available here: https://urldefense.com/v3/__http://www.ferc.gov/efiling-help.asp__;!!KNMwiTCp4spf!DxzRXyfU8ru8kgI6CC0O2Wn_s_P9KGqsBgmullpBdBQBMb7E8EaH8OavxryWAM8oP8i3HnJ52uFn1G6erCZ3h4q3vi_n9qR9RyWd$ or for phone support, call 866-208-3676. Power Generation 300 Lakeside Drive Oakland, CA 94612 Mailing Address: P.O. Box 28209 Oakland, CA 94604 May 29, 2025 Via Electronic Submittal (E-File) Debbie-Anne Reese, Secretary Federal Energy Regulatory Commission Division of Hydropower Administration and Compliance 888 First Street, NE Washington, D.C. 20426 RE: Poe Hydroelectric Project, FERC No. 2107-CA 2024 Amphibian Monitoring Report Dear Secretary Reese: This letter presents the Results of 2024 Surveys for Foothill Yellow-legged Frog (Rana boylii) on the Poe Reach of the North Fork Feather River report (2024 Amphibian Monitoring Report) for Pacific Gas and Electric Company’s (PG&E) Poe Hydroelectric Project, Federal Energy Regulatory Commission (FERC) No. 2107. Pursuant to the Poe Amphibian Monitoring Plan, approved by FERC on November 24, 2020, PG&E provided a draft 2024 Amphibian Monitoring Report to the United States Forest Service (USFS), California State Water Resources Control Board (SWRCB), California Department of Fish and Wildlife (CDFW), and United States Fish and Wildlife Service (USFWS; collectively, Agencies) by email on March 13, 2025. The Agencies provided no comments on the report. The agency consultation record is provided in (Enclosure 1) and the 2024 Amphibian Monitoring Report is provided in (Enclosure 2). If you have questions or comments regarding this matter, please contact Anna Urias, license coordinator for PG&E, at (530) 201-1961. Sincerely, Megan Young Hydro License Project Manager Enclosures: 1. Agency Consultation Record via Email 2. Results of 2024 Surveys for Foothill Yellow-legged Frog (Rana boylii) on the Poe Reach of the North Fork Feather River, dated May 2025 cc: See Attached List Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Debbie-Anne Reese, Secretary May 29, 2025 Page 2 cc: via email w/enclosures Kurt Sable, Forest Service - kurt.sable@usda.gov Dawn Alvarez, Forest Service - dawn.alvarez@usda.gov Leigh Bartoo, USFWS - Aondrea_Bartoo@fws.gov Beth Lawson, CDFW - Beth.Lawson@wildlife.ca.gov Michael Maher, CDFW - Michael.Maher@wildlife.ca.gov Jessica Dyke, SWRCB - Jessica.Dyke@Waterboards.ca.gov Nathan Fisch, SWRCB - Nathan.Fisch@Waterboards.ca.gov Document Accession #: 20250529-5106 Filed Date: 05/29/2025 ENCLOSURE 1 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 From:Herman, Andie To:Bartoo, Aondrea; Sable, Kurt -FS; Nathan.Fisch@waterboards.ca.gov; Jessica.Dyke@Waterboards.ca.gov; loren.everest@usda.gov; Brenzovich, Erika -FS; Alvarez, Dawn -FS; Lawson, Beth@Wildlife; Maher, Michael@Wildlife; Edlund, Leslie - FS Cc:Herman, Andie; Urias, Anna; Larson, Anika; Reyes, Catalina Subject:Review: Poe Draft 2024 FYLF Report Date:Thursday, March 13, 2025 4:17:10 PM Attachments:2024 Poe FYLF Draft Report for Agency Review _031325.pdf Hello, The 2024 Draft Foothill Yellow-legged Frog Monitoring Report for the Poe Project is ready for review. This report includes year five habitat assessment reporting. Please let us know by April 29, 2025, if you would like to set up a meeting to discuss your comments and please provide any written comments by COB May 13, 2025, at the latest. PG&E will file the final draft of the report with FERC by May 31, 2025. See filing and consultation requirements from the Amphibian Monitoring Plan below. PG&E will submit a draft of the Poe Reach amphibian population monitoring report to the SWRCB, Forest Service, USFWS, and CDFW on or before March 15 following each monitoring year. PG&E will allow the Agencies at least 60 days to review and comment on the draft report and will set up a consultation meeting if requested by the Agencies. The final annual report will be filed with FERC by May 31. PG&E will include in the final report any comments and recommendations made by the agencies on the draft report. If PG&E does not adopt a recommendation, the filing shall include PG&E’s reasons based on project-specific information. Please let me know if you have any questions. Thank you, Andie Andie Herman | 530-680-9037| andie.herman@pge.com Senior Aquatic Biologist - Herpetologist| Pacific Gas and Electric Company Document Accession #: 20250529-5106 Filed Date: 05/29/2025 ENCLOSURE 2 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 PACIFIC GAS AND ELECTRIC COMPANY Poe Project FERC Project No. 2107 Results of 2024 Surveys for Foothill Yellow-legged Frog (Rana boylii) on the Poe Reach of the North Fork Feather River May 2025 ©2025, Pacific Gas and Electric Company Document Accession #: 20250529-5106 Filed Date: 05/29/2025 PACIFIC GAS AND ELECTRIC COMPANY Poe Project FERC Project No. 2107 Results of 2024 Surveys for Foothill Yellow-legged Frog (Rana boylii) on the Poe Reach of the North Fork Feather River May 2025 ©2025, Pacific Gas and Electric Company Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Citation: Pacific Gas and Electric Company. 2025. Results of 2024 Surveys for Foothill Yellow-legged frog (Rana boylii) on the Poe Reach of the North Fork Feather River. May 19, 2025. Oakland, CA. Prepared by Kleinfelder, San Francisco, CA. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Table of Contents i May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company TABLE OF CONTENTS List of Tables .................................................................................................................................. ii List of Figures ................................................................................................................................ iii List of Appendices ......................................................................................................................... iv Executive Summary ........................................................................................................................ v 1.0 Introduction ...................................................................................................................... 1-1 2.0 Methods............................................................................................................................ 2-1 2.1 Egg Mass Surveys ........................................................................................................ 2-1 2.2 Protocol 2 Spill Recession Surveys ............................................................................. 2-2 2.3 Young-of-the-Year Surveys ......................................................................................... 2-3 2.4 Water Temperature Monitoring ................................................................................... 2-3 2.5 Habitat Assessment Survey.......................................................................................... 2-4 3.0 Results .............................................................................................................................. 3-1 3.1 Egg Mass Surveys ........................................................................................................ 3-1 3.1.1 Egg Mass Habitat ................................................................................................. 3-4 3.1.2 Oviposition Period ............................................................................................... 3-5 3.1.3 Egg Mass and Tadpole Scouring and Stranding .................................................. 3-7 3.1.4 Observations of FYLF during Spring/Summer Surveys ...................................... 3-8 3.2 Protocol 2 Spill Recession Surveys ............................................................................. 3-8 3.3 Young-of-the-Year Surveys ....................................................................................... 3-10 3.4 Water Temperature Monitoring ................................................................................. 3-18 3.5 Habitat Assessment Survey........................................................................................ 3-18 4.0 Discussion ........................................................................................................................ 4-1 4.1 Scouring and Stranding of Egg Masses and Tadpoles in 2024 .................................... 4-1 4.2 Egg Masses Laid in Tributaries ................................................................................... 4-2 4.3 Habitat Assessments .................................................................................................... 4-2 4.4 Wildfires ...................................................................................................................... 4-3 5.0 Recommendations ............................................................................................................ 5-1 6.0 References ........................................................................................................................ 6-1 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Table of Contents ii May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company LIST OF TABLES Table 3-1. Egg mass survey results on the Poe Reach of the NFFR, 2024. .......................... 3-1 Table 3-2. Egg mass counts and lambda (λ) estimates on the Poe Reach of the NFFR, 2001– 2024. .................................................................................................................. 3-2 Table 3-3. Egg mass oviposition site characteristics on the Poe Reach of the NFFR, 2024. 3-5 Table 3-4. Summary of key FYLF breeding season characteristics for the Poe Reach of the NFFR, 2003–2024. ............................................................................................ 3-7 Table 3-5. Young-of-the-year survey results on the Poe Reach of the NFFR, 2007–2024. 3-11 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Table of Contents iii May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company LIST OF FIGURES Figure 1-1. Poe Reach FYLF Monitoring Sites, 2024 ............................................................ 1-3 Figure 2-1. Mean daily flow on the Poe Reach in 2024 during the oviposition period (pink and gray shading) and Protocol 2 Spill Recession period (gray and blue shading). Note: Mean daily flow not reported for April 30 to May 2, 2024. .................... 2-2 Figure 3-1. Annual egg mass counts on the Poe Reach, 2002–2024. Dotted line shows the trend across years. ....................................................................................................... 3-3 Figure 3-2. Site distribution of egg masses on the Poe Reach, 2002–2024. Site 7 was added in 2020. .................................................................................................................. 3-4 Figure 3-3. Mean daily flow and water temperatures in relation to FYLF oviposition period with scouring and stranding of egg masses/tadpoles in the Poe Reach, 2024. Note: Mean daily flow not reported for April 30 to May 2, 2024. .............................. 3-6 Figure 3-4. Scouring and stranding of FYLF egg masses or tadpole groups during the Protocol 2 Spill Recession for the Poe Reach, 2024. Inferred egg masses without an oviposition date are not shown. ......................................................................... 3-9 Figure 3-5. Stranding of four oviposition sites at Site 4 during the Protocol 2 Spill Recession for the Poe Reach, 2024. Blue line represents mean daily flow; open circles represent estimated distance from shore on the estimated oviposition date; solid circles represent field measurements of distance to shore; dotted lines represent 2-day moving average; vertical gray line indicates point of stranding for each egg mass; negative distance to shore values indicate the distance to the receding edgewater from the stranded oviposition site. ................................................. 3-10 Figure 3-6. 2024 Breeding and YOY Survey Results by Life Stage, Site 7. ........................ 3-12 Figure 3-7. 2024 Breeding and YOY Survey Results by Life Stage, Site 4. ........................ 3-13 Figure 3-8. 2024 Breeding and YOY Survey Results by Life Stage, Site 3. ........................ 3-14 Figure 3-9. 2024 Breeding and YOY Survey Results by Life Stage, Sites 5 and 6. ............ 3-15 Figure 3-10. 2024 Breeding and YOY Survey Results by Life Stage, Sites 1 and 2. ............ 3-16 Figure 3-11. Reach-wide YOY survey results in the Poe Reach from 2007 through 2024. .. 3-17 Figure 3-12. Mean hourly water temperatures recorded with Onset Stowaway TidbiT® loggers in the upper (Site 7) and lower (Site 1) Poe Reach of the NFFR, 2024. Air temperatures were obtained from the Jarbo Gap weather station. The FYLF oviposition period (May 19–June 16) is represented by the shaded blue area. 3-18 Figure 3-13. Habitat Assessment measurements recorded on June 22, 2020 and July 24, 2024 for Poe Reach FYLF designated breeding subsites. Mean Daily Flows during HAs were 335 cfs on June 22, 2020 (CD) and 467 cfs on July 24, 2024 (N). ........ 3-19 Figure 3-14. Total search area from Habitat Assessment measurements recorded on June 22, 2020 and July 24, 2024 for Poe Reach FYLF designated breeding subsites. Mean Daily Flows during HAs were 335 cfs on June 22, 2020 (CD) and 467 cfs on July 24, 2024 (N). .................................................................................................... 3-20 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Table of Contents iv May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company LIST OF APPENDICES Appendix A: Minimum Instream River Flow Schedule (Table 1), First Five-year Period for the Poe Reach SWRCB (WQC, Condition 1, Issued December 29, 2017) Appendix B: Summary of 2024 Visual Encounter Breeding Survey Results for Foothill Yellow-legged Frog on the Poe Reach of the North Fork Feather River Appendix C: Representative Photographs of the 2024 Surveys for Foothill Yellow-legged Frog on the Poe Reach of the North Fork Feather River Appendix D: Summary Table and Representative Photographs for Protocol 2 Spill Recession Foothill Yellow-legged Frog Surveys at Site 4, Site 7, and Subsite 1b on the Poe Reach of the North Fork Feather River Appendix E: Analysis of Mean Daily Flow and Egg Mass Observations during Breeding Surveys from 2019 to 2024 for Foothill Yellow-legged Frog on the Poe Reach of the North Fork Feather River Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Executive Summary v May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company EXECUTIVE SUMMARY This report summarizes the results of 2024 foothill yellow-legged frog (Rana boylii; FYLF) monitoring conducted in accordance with the Poe Amphibian Monitoring Plan and the Ramping Rates Plan for the Poe Hydroelectric Project, Federal Energy Regulatory Commission (FERC) Project No. 2107. FERC issued Pacific Gas and Electric Company (PG&E) a new license on December 17, 2018. On November 24, 2020, FERC approved the Amphibian Monitoring Plan (Plan), which PG&E developed in consultation with California Department of Fish and Wildlife, United States Fish and Wildlife Service, United States Forest Service, and State Water Resources Control Board staff (collectedly referred to as the Agencies), to assess the population response of the Poe Reach FYLF population to the new license-required instream flows. The Plan calls for annual egg mass surveys to determine the number of egg masses deposited each year. These counts are the best way to monitor population trends over time and can be compared year-to-year, as each adult female FYLF produces a single egg mass each year. The Plan also includes three fall reach- wide young-of-year (YOY) surveys, conducted annually, to contribute to the analysis of population distribution, viability, metamorph recruitment, and habitat suitability analysis. After metamorphosis, YOY remain near natal habitats for a period in late summer and early fall and are therefore a good indicator of reproductive habitat suitability for this species. On March 27, 2023, FERC approved the Ramping Rates Plan which also includes additional FYLF monitoring to be performed in association with two spill recession protocols (Protocol 1 and Protocol 2) designed to mimic the naturally receding hydrograph during the typical FYLF breeding and rearing season with the purpose of determining spill recession effectiveness. While 2024 was classified as a Normal water year type, heavy snowmelt created higher than usual flow levels in the Poe Reach which continued through May and into late June limiting a full suite of FYLF egg mass surveys until June 5. Spring flows met the criteria which trigger Protocol 2 (1,200 cfs during May 1–15) through late May and into late June. Protocol 2 FYLF surveys began on May 30 and continued through June 26. Annual FYLF egg mass surveys were conducted at the 15 established breeding subsites in 2024. Visual encounter surveys began April 11 and ended June 25 and occurred at approximately 10- day intervals. Protocol 2 spill recession surveys were conducted at three sites (Subsite 1b, Site 4, and Site 7) and included ten surveys starting on May 30 (after flow levels reached approximately 1,200 cfs) and continuing until base flow levels (approximately 500 cfs) were reached on June 26. These surveys focused on locating egg masses and tadpole groups and recording any scoured or stranded egg masses or tadpoles. Two reach-wide YOY surveys were conducted in 2024 on August 6–7 and September 4–5. The reach-wide YOY survey scheduled for October 22-23 was cancelled due to unexpected high operational flows. Fifty-seven egg masses (including 22 not found during the egg mass stage but inferred by distinct tadpole groups found post-hatch) were recorded at nine breeding subsites and one tributary in the Poe Reach in 2024. These results are similar to most other Normal water years (e.g., 2003–2005, 2008, and 2016) and the oviposition period of 28 days was average for a Normal water year in the Poe Reach. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Executive Summary vi May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Nine egg masses were found scoured and eight egg masses were found stranded in 2024 (at subsites 4a, 4b, 4d, 7a, and 7b), all attributed to the Protocol 2 spill recession flow reductions. In addition, 27 tadpole stranding incidents were recorded at nine flow level reductions (Appendix D) during the spill recession. The YOY counts during reach-wide surveys were lower than averages from previous Normal and even Wet water year types and the lower numbers may reflect lost egg masses or hatched tadpoles that were scoured during high flow levels when sites were inaccessible for surveys. While the Protocol 2 Spill Recession resulted in stranding of egg masses and tadpoles, it was not intended to eliminate loss entirely and may have contributed to creating more optimal conditions when compared to impacts of Normal or Wet water years without a spill recession ramp-down. Egg masses have been stranded from operational flow reductions in past years and the spill recession protocol is meant to moderate flow reduction events during the breeding period in high flow years. As 2024 is the second year of implementation of the Spill Recession Protocol 2, more data are needed to determine if further fine-tuning can prevent additional strandings; however, the natural variability of site-specific physical habitat conditions will always preclude a one-size-fits- all strategy. Future egg mass and YOY surveys will allow for continued comparisons of scouring at sites 4 and 7, as well as stranding and survival at all breeding sites. Impacts to tadpoles, and therefore losses, haven’t been studied or documented during ramp-downs prior to the Protocol 2 spill recession in 2023. Monitoring of up to two additional spill recession protocols (one Protocol 1 and one Protocol 2), as required in the Ramping Rates Plan, will allow for comparisons to be made on effects to early stage tadpoles. Overall decreases in egg mass numbers have been observed since 2021 and may be attributable to the higher base flows under the new license which have partially or completely inundated breeding habitat at many of the known breeding sites (as observed in 2021 to 2023) and/or to siltation events that have regularly occurred during the breeding season throughout the Poe Reach since the recent Camp, Dixie, and Bear wildfires. Habitat assessments are required to assess FYLF breeding habitat at designated Poe Reach breeding subsites (required by FERC) and throughout the Poe Reach (required in the Plan) (FERC 2018; PG&E 2020a). Detailed habitat assessments at the designated breeding sites were conducted in 2000, 2003, and 2020 (GANDA 2003, PG&E 2004, and PG&E 2021, respectively). A full reach-wide habitat assessment was undertaken in 2024 after several previous attempts in 2021, 2022, and 2023 to complete the survey were thwarted due to issues with wildfire cancellations, high flows preventing safe access, and achieving the appropriate base flow level at the time of the survey. The 2024 reach-wide habitat assessment was conducted to delineate the areas of suitable breeding habitat at the base flow level both within designated breeding sites and outside of designated breeding sites. No suitable habitat was identified outside of designated breeding sites in 2024 because most areas of potentially suitable habitat in the Poe Reach are inundated under the license base flow regime. Results of the assessment for designated breeding subsites revealed a 60 percent decrease in FYLF breeding habitat compared to the 2020 Habitat Assessment. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 1.0 Introduction 1-1 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company 1.0 Introduction On December 17, 2018, the Federal Energy Regulatory Commission (FERC) issued a new license for Pacific Gas and Electric Company’s (PG&E or Licensee) Poe Project, FERC Project Number (No.) 2107 (Project) on the Poe Reach of the North Fork Feather River (NFFR) in Butte County, California (FERC 2018). The new license incorporates State of California State Water Resources Control Board (SWRCB) 401 Water Quality Certification (WQC) Condition 9 and United States Department of Agriculture Forest Service (Forest Service) 4(e) Condition 25 into the license articles. These conditions require PG&E to develop an amphibian monitoring plan to monitor special-status amphibians within the Poe Reach, namely for foothill yellow-legged frog (Rana boylii; FYLF). The Poe Amphibian Monitoring Plan (Plan; PG&E 2020a) was approved by FERC order on November 24, 2020. The Plan was designed to comply with the amphibian monitoring requirements of SWRCB WQC Condition 9 and Forest Service 4(e) Condition 25, elements of which were also incorporated into FERC License Article 401 (FERC 2018). The Plan was developed in consultation with the California Department of Fish and Wildlife (CDFW), the United States Fish and Wildlife Service (USFWS), the Forest Service, and SWRCB staff (collectively referred to as the Agencies). The Plan was revised in 2023 to include a new requirement to analyze mainstem water temperature annually in association with the initiation of FYLF breeding (PG&E 2020a) and was sent to FERC for approval on December 26, 2023. In addition, Condition 23 (incorporated into FERC License Article 401) requires the creation of a Poe Ramping Rates Plan (RRP), approved by FERC March 27, 2023 (PG&E 2023a). The RRP specifies that PG&E will implement one of two protocols (Protocol 1 or Protocol 2) for initiating a tempered spill-recession regime during high flows. Under Protocol 1, spill recession is initiated if flows are at 800 cubic feet per second (cfs) after April 15; under Protocol 2, spill recession begins if flows are at 1,200 cfs from May 1 through May 15. The Plan identifies focused FYLF monitoring to assess the effectiveness of ramping rates and the RRP further specifies FYLF monitoring surveys for egg masses and early stage tadpoles during both Protocol 1 and Protocol 2 events. Due to heavy snowmelt in 2024, flows met the criteria for Protocol 2 (1,200 cfs during May 1–15) through late May and into late June. Thus, Protocol 2 was triggered and spill-recession FYLF surveys focused on three sites (Subsite 1b, Site 4, and Site 7; Figure 1-1) began on May 30, after flow levels reached approximately 1,200 cfs, and continued until base flow levels were reached on June 26 (Figure 2-1; Appendix D). The North Fork Feather River FYLF population is both State and Federally listed as Threatened (CFGC 2020; USFWS 2023). Much is known about the current distribution and habitat use and preferences of FYLF in the Poe Reach, as PG&E has been researching and monitoring FYLF in the Poe Reach regularly since 2001—often as a control reach for studies in the upstream Cresta Reach (PG&E 2003, 2004) (part of the Rock Creek-Cresta Project [FERC Project No. 1962])— resulting in numerous annual monitoring reports and studies on the effects of various base flow changes on FYLF habitats. Between 2005 and 2018, the objective of the FYLF surveys in the Poe Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 1.0 Introduction 1-2 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Reach has been to monitor the number of egg masses at selected known breeding locations as an index of population trends in comparison to the Cresta Reach. The Poe Reach has been considered the control reach in this context because, until 2019, it had not experienced recreational pulse flows or modified base flows like the Cresta Reach. In February 2019, PG&E began operating the Poe Reach flows according to the Minimum Instream River Flow (MIF) schedule specified in SWRCB, WQC Condition 1 for the new license (FERC 2018), which includes both a modified, increased base flow schedule and recreational pulse flows. The first recreational flow occurred on October 1 and 2, 2022. While developing the new license study plan, egg mass and young-of-the-year (YOY) surveys continued for FYLF on the Poe Reach, thus maintaining the continuity of the long-term dataset. Beginning in 2020 and henceforth, Poe Reach monitoring for FYLF was managed under the new Plan which also included habitat assessment surveys in 2020 and 2024. This report summarizes the 2024 methods and results of: 1) egg mass surveys; 2) Protocol 2 Spill Recession surveys; 3) YOY surveys; 4) water temperature monitoring; and 5) habitat assessment surveys. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Cr e a t e d B y : A F r y j o f f H u n g D o c u m e n t P a t h : \ \ a z r g i s s t o r p 0 3 \ G I S _ P r o j e c t s \ C l i e n t \ G A N D A \ P G E \ F Y L F _ S u r v e y s \ 2 4 0 0 1 3 6 8 _ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 \ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 . a p r x Figure 1-1. Poe Reach FYLF Monitoring Sites, 2024 Butte County, California 0 500 1,000 Meters 0 1,500 3,000 Feet 1 inch = 3,000 feet Scale 1:36,000 ± Project Location ^_ Poe Powerhouse 2d2d 2a2a 4a4a 6d6d 4b4b 1b1b 7c7c 2c2c 4c4c 7b7b 7a7a 4d4d 55 33 6c6c Ro c k C r e e k Tributary 6 Tributary 5 Flea ValleyCreek Do g w ood Creek Cirb y Cree k Mill Creek LastChance Creek Camp Creek Heinz Creek No lto n Cre e k Nort h F o r k F ea t h e r Ri v e r South Branch MillCreek Ston y Cree k ConcowCreek Poe Dam ·|}þ70 Poe Reach - FYLF site ^_ Project Location TEHAMA COUNTY PLUMAS COUNTY BUTTE COUNTY Æÿ70Æÿ32 Æÿ89 Æÿ162 Æÿ49 Æÿ191 Æÿ99 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 2.0 Methods 2-1 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company 2.0 Methods 2.1 Egg Mass Surveys The purpose of 2024 egg mass surveys was to locate and enumerate egg masses at established FYLF breeding sites on the Poe Reach. Fifteen designated breeding subsites were surveyed in the Poe Reach (1b, 2a, 2c, 2d, 3, 4a, 4b, 4c, 4d, 5, 6c, 6d, 7a, 7b, and 7c) (Figure 1-1; Photos 1–17, Appendix C). Spring breeding surveys in 2024 were extremely limited during high flow levels in the Poe Reach. On April 11, the first survey was conducted at four subsites (Site 3, subsites 4a, 4b, and 7a) where the only safe access was restricted to a few meters along the shoreline. Between April 11 and June 25, nine pedestrian visual encounter surveys (VES) were conducted at various subsites as each became accessible, but it was not until June 5, when flows receded to approximately 1,194 cfs, that all subsites could be surveyed (Appendix B). During surveys, mean daily flows (PG&E NF23 gage) were reported as between 4,456 cfs on April 24 and 532 cfs on June 25. Surveys in Tributary 5 began on April 23 and were conducted approximately every 10 days through June 25 to look for signs of breeding (i.e., spent females). Tributary 5 is regularly used for access to the mainstem breeding sites downstream of Site 5 (Figure 1-1). Surveys occurred at approximately seven to 10-day intervals until no new egg masses had been observed for two survey rounds and when flows reached base flow level (approximately 450 cfs) at the completion of the Protocol 2 Spill Recession. All egg mass surveys were conducted following PG&E’s standardized survey protocol (Seltenrich and Pool 2002) and were performed with at least two surveyors. The survey protocol was modified in 2003 to include one snorkeler and one wading surveyor; due to swift edgewater velocities from high flow levels during the earlier spring breeding surveys, snorkeling surveys began in late May. Wading surveyors used Plexiglas® viewing boxes and polarized sunglasses to enhance visibility. Surveys were conducted from the downstream end of each subsite to the upstream end, with a single pass through each subsite. When an egg mass was located, a standard list of habitat parameters was measured and recorded. These parameters included location of the egg mass within the site, attachment substrate, distance from shore, depth of egg mass and maximum stream depth at the egg mass, velocity at the egg mass, surface velocity, edgewater and mainstem water temperatures, water temperature at the egg mass, egg mass size, and Gosner developmental stage (to determine the date of oviposition; Gosner 1960). Although surveys focused on locating egg masses, all life stages of frogs encountered were documented and appropriate data sheets were completed for each. Data collected on each adult frog captured during egg mass and reach-wide surveys included location, snout-urostyle length (SUL), weight, sex, condition (i.e., gravid or spent), and a chin photo, enabling comparisons of each frog’s unique pigmentation pattern with previously captured individuals (Marlow et al. 2016). For data analysis, egg mass counts were summarized for each site and subsite. These counts were converted to densities (number of egg masses per square meter [#/m2]) and search effort (#/hour) Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 2.0 Methods 2-2 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company for standardization. The number of egg masses per square meter (m2) was calculated by dividing the number of egg masses by the area surveyed. The number of egg masses per survey hour (person-hours) was calculated by dividing the number of egg masses by the survey time, excluding time for data recording. Oviposition dates were approximated by back-dating from Gosner stages as follows: four stages/day the first two days, two stages/day the next four days, then one stage/day until hatching. Lambda (λ), the annual rate of change in population size, was calculated by dividing the annual egg mass count by the previous year’s egg mass count. Lambda values equal to 1.0 indicate stable populations; values greater or less than 1.0 indicate increasing and decreasing populations, respectively. 2.2 Protocol 2 Spill Recession Surveys During the spill recession period on the Poe Reach, a total of 10 VES surveys were conducted at subsites 1b, 4a, 4b, 4c, 4d, 7a, 7b, and 7c between May 30 and June 26 (Figure 2-1; Appendix D). Of these, one survey (on June 25) was conducted concurrently with the annual VES breeding survey. It should be noted that Site 4 was not originally included in the Plan but was added in 2023 when no egg masses or other breeding activity was observed at Subsite 1b. Figure 2-1. Mean daily flow on the Poe Reach in 2024 during the oviposition period (pink and gray shading) and Protocol 2 Spill Recession period (gray and blue shading). Note: Mean daily flow not reported for April 30 to May 2, 2024. Surveys were conducted every one-to-seven days and were performed with two-to-four pedestrian surveyors. Surveys were conducted following the egg mass survey protocol and were focused on locating egg masses and tadpole groupings (representing egg mass hatch sites) and recording potential scourings and/or strandings that might occur during the spill recession. Measurements Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 2.0 Methods 2-3 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company included the standard list of egg mass habitat parameters, if available, and included a distance to edgewater measurement when an egg mass (or associated tadpole group) was found stranded. Staff gages marking each flow level were placed at two oviposition sites (subsites 4b and 7b) at the concurrent edgewater, marked with the date and flow, and photographed during every survey (Appendix D). Data collected included photographs of distance to shore/edgewater measurements and documentation of scourings and strandings (Appendix D). 2.3 Young-of-the-Year Surveys To better understand the distribution and abundance of breeding FYLF throughout the Poe Reach, expanded reach-wide YOY searches were initiated in 2007. The goal of these surveys was to identify additional breeding sites not currently known or monitored and provide an index of annual recruitment. The survey timing—from August to October—was chosen because YOY frogs are present in the late summer and early fall at, or near, the breeding sites where they hatched (PG&E 2020a). In 2024, full reach-wide YOY surveys were completed on August 6–7 and September 4– 5. Surveys were attempted in October, but unexpected operational flows prevented safe access to the river and surveys were cancelled. Surveys for YOY included all habitats along the reach as well as the known, numbered breeding sites and were performed by teams of two pedestrian surveyors walking along the bank to flush YOY frogs. Although YOY were the focus of the surveys, data were recorded on all life stages observed. Data collection included all the parameters recorded for adult and juvenile frogs. 2.4 Water Temperature Monitoring As a result of flow changes implemented in 2009, the Ecological Resources Committee (ERC) for the Rock Creek-Cresta Hydroelectric Project and the Forest Service requested a water temperature monitoring study as described in the Rock Creek-Cresta ERC Annual Condition 22 Report (ERC 2009; page 16): Water temperature monitoring in breeding locations will be added to the monitoring program with a HOBO-like device. Temperature monitoring will be done at […] a subset of reference sites in the Poe Reach. Monitors will be in place through metamorphosis and removed on or after September 30. Water temperature monitoring was initiated in 2009 in the Poe Reach as part of the Rock Creek- Cresta study and has continued, with modifications, through 2024. To obtain mainstem channel water temperatures, Onset Stowaway TidbiT® temperature recording loggers were installed in two locations in the reach, one at the upstream end and one at the downstream end. Loggers were inserted into perforated PVC pipes and attached with a plastic-coated metal cable to edgewater vegetation. Temperature loggers were set to record at one-hour intervals. The upstream logger was installed in a mainstem pool upstream of the Mill Creek confluence and Subsite 7b, and the downstream logger was placed in the pool upstream of Poe Powerhouse and Subsite 1b. Mainstem loggers were installed on April 1 and retrieved on October 24, 2024. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 2.0 Methods 2-4 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company 2.5 Habitat Assessment Survey Detailed habitat assessments at the designated breeding sites were conducted in 2000, 2003, and 2020 (GANDA 2003, PG&E 2004, and PG&E 2021, respectively). Additional reach-wide habitat assessments, as outlined in the Plan, were to be conducted by the end of License Year 2 (2020) and again by the end of License Year 5 (2023). The assessment(s) of potential breeding habitat outside of designated breeding sites was scheduled to occur during fall YOY surveys in 2021 but was not completed because two of the three scheduled reach-wide surveys were cancelled. In 2022 and 2023, habitat assessments were scheduled to be conducted as a separate reach-wide survey during the spring breeding period, but conditions under the new, higher flow schedule in 2022 and high flow levels in 2023 precluded safe access. Following the August MIF Variance in 2023, flow levels were drawn down to approximately 100 cfs, far below the license’s base flow scenario (400 to 500 cfs in a Wet WYT) and habitat assessments were again not completed (PG&E 2024). To address this, PG&E presented the SWRCB with an updated Plan and schedule on April 29, 2024 to complete the License Year 5 Suitable Habitat Assessment in 2024. The Plan allows the habitat assessment schedule to be updated with concurrence from the SWRCB Deputy Director (PG&E 2024) and a reach-wide Habitat Assessment survey was conducted on July 24, 2024 (Seltenrich and Pool 2002). The survey was conducted by two crews of two pedestrian surveyors and length and width measurements were recorded using 10-m or 100-m measuring tapes or a laser range finder (for longer subsites). Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-1 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company 3.0 Results 3.1 Egg Mass Surveys Fifty-seven egg masses (including 22 inferred by tadpole groups) were recorded at nine breeding subsites (2c, 4a, 4b, 4c, 4d, 5, 7a, 7b, 6c, and in one tributary associated with breeding Site 3) (Table 3-1; figures 3-1 and 3-2). A total of 98.82 person-hours were spent surveying approximately 5,035 m2 within the established monitoring sites, resulting in 0.577 egg masses per survey hour (Table 3-1). In 2024, the lambda value was 1.39 on the Poe Reach (Table 3-2). Number of person- hours includes survey time during the Spill Recession surveys at Subsite 1b, and sites 4 and 7. During breeding VES and spill recession surveys from May 29 to June 26, 35 egg masses and 22 new tadpole groups (inferring egg masses) were observed at subsites 2c, 4a, 4b, 4c, 4d, 6c, 7a, and 7b; Site 5; and in one tributary associated with Site 3. Of these, eight egg masses were found on May 29, one day before the Protocol 2 Spill Recession began. Table 3-1. Egg mass survey results on the Poe Reach of the NFFR, 2024. Subsite Masses1 (M2) Egg Mass per M2 Search Time2 (Hours) Search Time (Min/M2) Egg Masses per Survey Hour 1b 0 279 0.000 7.05 1.516 0.000 2a 0 168 0.000 2.23 0.796 0.000 2c 1 334 0.003 3.00 0.539 0.333 2d 0 156 0.000 0.75 0.288 0.000 3 1* 7a 6 396 0.015 6.62 1.003 0.907 7b 9 300 0.030 12.52 2.503 0.719 7c 0 45 0.000 4.27 5.689 0.000 Totals 57 5,035 0.011 98.82 1.178 0.577 1 Egg mass count includes 35 egg masses and 22 egg masses inferred by tadpole groups not previously observed. 2 Search times include Spill Recession surveys at Subsite 1b, Site 4, and Site 7 * One egg mass found in a tributary stream above Site 3 is included in the Site 3 count. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-2 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Table 3-2. Egg mass counts and lambda (λ) estimates on the Poe Reach of the NFFR, 2001–2024. Poe Reach 2001 CD1 2002 N 2003 N 2004 N 2005 N 2006 W 2007 CD 2008 CD 2009 D 2010 N 2011 W 2012 D 2013 D 2014 CD 2015 CD 2016 N 2017 W 2018 N 2019 W 20202 CD 2021 CD 2022 D 2023 W 20243 N 1b 2 6 3 4 ns 2 18 14 5 12 2 8 11 16 21 21 4 7 16 7 7 0 0 0 2a 3 3 2 2 ns 3 4 14 5 5 2 9 7 9 9 1 1 1 3 4 1 1 0 0 2c 2 2 1 1 ns 2 13 11 8 8 2 8 11 6 18 4 10 3 3 6 3 3 1 1 2d ns4 ns ns ns ns 6 1 2 4 4 0 1 2 3 3 1 0 2 0 2 1 0 0 0 3 8 6 2 2 ns 0 0 9 6 10 3 1 3 3 4 2 0 7 7 2 3 0 1 1 4a 3 6 13 11 6 4 5 15 9 19 0 6 5 18 11 1 2 11 3 13 6 19 3 16 4b 1 4 6 7 7 12 5 6 23 20 4 7 19 13 17 10 1 13 0 17 11 7 10 10 4c 4 5 5 5 ns 0 6 8 7 5 0 7 11 18 12 15 1 6 2 7 8 4 3 4 4d 3 2 6 8 1 4 6 11 11 2 1 7 12 27 22 8 2 10 1 5 4 8 3 4 5 ns ns 2 4 7 17 12 11 11 11 2 6 5 7 8 4 4 8 6 15 23 9 2 3 6c ns ns 6 16 39 39 40 31 34 47 19 28 20 18 21 7 10 6 4 30 23 4 1 3 6d ns ns ns 7 3 0 2 5 2 7 2 5 4 0 8 1 1 1 0 2 2 0 1 0 7a ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4 6 5 3 6 7b ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns 15 15 4 11 9 7c ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns 7 1 6 2 0 Total 26 34 46 67 63 89 112 137 125 150 37 93 110 138 154 75 36 75 45 110 114 70 41 57 λ na 1.3 1.35 1.45 0.94 1.41 1.26 1.21 0.91 1.2 0.25 2.51 1.18 1.25 1.12 0.49 0.48 2.08 0.60 2.40 1.04 0.61 0.59 1.39 1 Water year types: CD= Critically Dry, D= Dry, N= Normal, W= Wet 2 Lambda calculated excluding Site 7 (total egg masses = 136) in 2020; Site 7 was included in 2021–2024 calculations. 3 Some egg masses inferred from tadpole groups 4 ns=Not surveyed Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-3 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Figure 3-1. Annual egg mass counts on the Poe Reach, 2002–2024. Dotted line shows the trend across years. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-4 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Figure 3-2. Site distribution of egg masses on the Poe Reach, 2002–2024. Site 7 was added in 2020. 3.1.1 Egg Mass Habitat Egg masses were located on average 1.8 m from shore with a range from -0.73 to 5.51 m, and at an average depth of 23.2 centimeters (cm) (range= -0.05 to 50 cm) when first located (Table 3-3). Mean maximum water depth at egg mass locations was 30.6 cm (range= 0.25 to 55 cm). Mean water velocity at egg mass locations was 3.3 cm/second (cm/s) and ranged between zero and 15 cm/s. Mean surface velocity above egg mass locations was 4.5 cm/s with a range of zero to 15 cm/s. Mean water temperature at the egg masses, when first observed, was 18.6 degrees Celsius (°C) and ranged from 16.0°C to 24.5°C (Table 3-3). Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-5 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Table 3-3. Egg mass oviposition site characteristics on the Poe Reach of the NFFR, 2024. Distance from Shore (m)* Egg Mass Depth (cm) Maximum Water Depth (cm) Velocity at Egg Mass (cm/s) Velocity Above Egg Water Temperature at Egg Mass (°C) Mean 1.8 23.2 30.6 3.3 4.5 18.6 1.5 13.6 15.2 4.9 4.8 2.5 * “-” distance from shore indicates stranded egg mass 3.1.2 Oviposition Period The 2024 estimated oviposition period was from May 19 to June 16, and the mean breeding date was May 29 (Table 3-4; Figure 3-3). The estimated duration of the 2024 breeding season was approximately 28 days, shorter than other Normal water year types (mean= 41.2 days, excluding 2024) (Table 3-4). The first evidence of breeding was observed in an unnamed tributary leading to Site 3 on May 29; however, this was a group of hatched tadpoles so the date of oviposition could not be estimated. Another egg mass on the mainstem Poe Reach was observed at Subsite 4b, also on May 29, at Gosner stage 21, indicating it was laid approximately 10 days earlier on May 19. One of the last intact egg masses observed was found on June 18 at Subsite 7b at Gosner stage 10, indicating it was laid approximately two days earlier on June 16. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-6 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Figure 3-3. Mean daily flow and water temperatures in relation to FYLF oviposition period with scouring and stranding of egg masses/tadpoles in the Poe Reach, 2024. Note: Mean daily flow not reported for April 30 to May 2, 2024. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-7 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Table 3-4. Summary of key FYLF breeding season characteristics for the Poe Reach of the NFFR, 2003–2024. Year Water Year Type1 Date First Egg Mass Laid Mean Breeding Date Egg Mass Breeding Season 2024 N 5/19 5/29 6/16 28 2023 W 6/1 6/14 6/26 25 2021 CD 4/12 5/12 6/8 57 2020 CD 4/25 5/16 6/10 46 2019 W 6/2 6/10 6/19 17 2017 W 5/28 6/11 6/25 28 2016 N 4/28 5/17 6/9 42 2013 D 4/21 5/11 6/6 46 2012 D 5/16 5/27 6/18 33 2011 W 5/31 6/18 7/6 36 2008 CD 4/16 5/12 6/5 51 2007 CD 4/27 5/24 6/18 56 2006 W 5/29 6/7 6/18 20 2003 N 5/20 5/28 6/6 17 Mean CD (n= 6) N (n= 7) 5/1 5/19 6/9 39.3 W (n= 5) 5/30 6/12 6/24 25.2 1 Water year types: CD= Critically Dry, D= Dry, N= Normal, W= Wet 3.1.3 Egg Mass and Tadpole Scouring and Stranding A total of nine egg masses were found scoured in 2024 at subsites 4a, 4d, and 7b (Figure 3-3; Appendix D). A total of eight attached egg masses were stranded: three were found stranded on June 6 at subsites 4a and 7a; two were found stranded at Subsite 7b on June 7 (one recorded scoured and stranded); and three were found stranded at subsites 4a and 7b on June 8. All scours and strands occurred during the Protocol 2 Spill Recession between May 30 and June 26. Seven egg masses were found to be detached from their oviposition site (not considered scoured), and three egg masses that were partially or fully frayed upon first observation, all at subsites 4a, 4d, 7a, and 7b. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-8 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Forty-nine oviposition sites (marked with flagging on first observation) at sites 4 and 7 were monitored during the Protocol 2 Spill Recession. During the spill recession period, the receding edgewater left 20 of these oviposition sites “dry” (egg masses had previously hatched and were not stranded) before base flows were reached on June 26. A number of egg masses hatched prior to the flagged oviposition site being exposed to desiccation, though tadpole strandings were a factor as flows receded (Appendix D). In addition to the eight stranded egg masses, a total of 27 tadpole stranding incidents were recorded at nine of the 10 flow levels during the spill recession on days 8, 9, 10, 14, 19, 20, 22, 27, and 28 (Appendix D; Figure 3-3). Tadpole groups were initially associated with egg mass locations, but as tadpoles developed, groups became mixed and some of the stranded tadpoles could not be precisely linked to a specific egg mass (Appendix D). 3.1.4 Observations of FYLF during Spring/Summer Surveys During egg mass, spill recession, and habitat assessment surveys in 2024, 186 adult and juvenile FYLF were observed on the Poe Reach and two tributaries associated with breeding sites (Tributary 5 and an unnamed tributary to Site 3; figures 3-6 through 3-11; Appendix B). This included 32 females, 42 males, 52 unknown gender adults, and 60 juveniles observed. Adult females that were captured and measured averaged 54.8 millimeters (mm) SUL (n= 27, range= 42 to 72 mm) and weighed an average of 24.7 grams (g) (n= 24, range= 10.0 to 65.5 g). Adult males averaged 48.8 mm SUL (n= 19, range= 41 to 58 mm) and weighed an average of 17.1 g (n= 9, range= 9.5 to 28.5 g; Photo 24, Appendix C). In 2024, a review of chin photographs of Poe individuals captured revealed that one adult FYLF (female) was previously captured in 2023. Chin photograph methodology has been utilized on the Poe since 2004. Between 2004 and 2024, a total of 1,795 distinct individuals (900 female and 895 male) have been identified in the Poe Reach. 3.2 Protocol 2 Spill Recession Surveys Forty-nine (86%) of the total egg masses (or tadpole groups that inferred egg masses) for 2024 were found during the spill recession period between May 30 and June 26. Of these, 34 egg masses/tadpole groups were found at subsites 4a, 4b, 4c, and 4d and 15 egg masses/tadpole groups were observed at subsites 7a and 7b; no egg masses or tadpole groups were observed at Subsite 1b during any surveys (Appendix D; Figure 3-4). Figure 3-5 depicts detailed measurements of four egg mass oviposition sites in relation to the receding edgewater at two Site 4 subsites during flow reductions. Numbers of stranded tadpoles were estimated to be in the thousands during the spill recession but could not be quantified with any accuracy (Appendix D). Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-9 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Figure 3-4. Scouring and stranding of FYLF egg masses or tadpole groups during the Protocol 2 Spill Recession for the Poe Reach, 2024. Inferred egg masses without an oviposition date are not shown. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-10 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Figure 3-5. Stranding of four oviposition sites at Site 4 during the Protocol 2 Spill Recession for the Poe Reach, 2024. Blue line represents mean daily flow; open circles represent estimated distance from shore on the estimated oviposition date; solid circles represent field measurements of distance to shore; dotted lines represent 2-day moving average; vertical gray line indicates point of stranding for each egg mass; negative distance to shore values indicate the distance to the receding edgewater from the stranded oviposition site. 3.3 Young-of-the-Year Surveys Two reach-wide YOY surveys were conducted on August 6–7 and September 4–5, 2024; the October reach-wide survey was cancelled due to high operational flows in the Poe Reach (Table 3-5). During the two surveys, a total of 75 YOY were observed (Photos 22–23, Appendix C). Of the 75 YOY, 36 were observed in August and 39 in September. Of the total YOY, 49 (65%) were observed at four designated breeding subsites (4c, 6c, 7a, and 7b; figures 3-6 through 3-11). On the Poe Reach, YOY averaged 22 mm SUL (range= 20 to 26; n= 3) and were not weighed. In addition to YOY, 13 adult females, one adult male, and 14 unknown gender adults were observed during the two reach-wide surveys. No juveniles were observed during the YOY surveys. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-11 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Table 3-5. Young-of-the-year survey results on the Poe Reach of the NFFR, 2007–2024. Survey Type Date Search Area (km) YOY/km 2007-CD Reach-wide 9/10 205 12.34 16.6 2008-CD Reach-wide 9/8 37 12.34 3.0 2009-D Reach-wide 9/8 95 12.34 7.7 2010-N 2011-W 2012-D Reach-wide 2 10/1 77 12.34 6.2 2014-CD 2015-CD Reach-wide 8/31 52 12.34 4.2 2016-N 2017-W 2018-N 2019-W 2022-D 2023-W 2024-N Total, Subsites Only 945 Mean YOY/km 80.5 Total, Reach-wides 1,866 Mean YOY/km 6.0 1 Water year types: CD= Critically Dry, D= Dry, N= Normal, W= Wet * Subsites 1b, 3, 4a, 4b, 4c, and 4d only Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Cr e a t e d B y : A F r y j o f f H u n g D o c u m e n t P a t h : \ \ a z r g i s s t o r p 0 3 \ G I S _ P r o j e c t s \ C l i e n t \ G A N D A \ P G E \ F Y L F _ S u r v e y s \ 2 4 0 0 1 3 6 8 _ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 \ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 . a p r x Figure 3-6. 2024 Breeding and YOY Survey Results by Life Stage Site 7 Butte County, California 0 15 30 Meters 0 50 100 Feet 1 inch = 100 feet Scale 1:1,200 ± Project Location ^_ !( !( !( !( !( ") ")XW #* #* #* #* #* #* #* 7a pool7a pool 7c7c 7b7b 7a7a Nor t h F o r k F e a t h e r R i v e r Egg Mass !(Adult Female ")Adult Male XW Adult Unknown #*Juvenile #*Young of the Year Poe Reach - FYLF site ^_ Project Location TEHAMA COUNTY PLUMAS COUNTY BUTTE COUNTY Æÿ70Æÿ32 Æÿ89 Æÿ162 Æÿ49 Æÿ191 Æÿ99 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Cr e a t e d B y : A F r y j o f f H u n g D o c u m e n t P a t h : \ \ a z r g i s s t o r p 0 3 \ G I S _ P r o j e c t s \ C l i e n t \ G A N D A \ P G E \ F Y L F _ S u r v e y s \ 2 4 0 0 1 3 6 8 _ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 \ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 . a p r x Figure 3-7. 2024 Breeding and YOY Survey Results by Life Stage Site 4 Butte County, California 0 15 30 Meters 0 50 100 Feet 1 inch = 100 feet Scale 1:1,200 ± Project Location ^_ !( !( !( !( !(!( ") ") ") ")") ") ") ")") ") ")")")") ")") ") ") ") ") ")")")") ") ")")")")XW XW XW XW XWXW XWXW XWXW XW XWXW #* #* #* #* #* #* #* #* #* #* #* #* #* #* #* 4a4a 4b4b 4c4c 4d4d North Fo r k F e a t h e r R i v e r Flea V a l l e y C r e e k Egg Mass !(Adult Female ")Adult Male XW Adult Unknown #*Juvenile #*Young of the Year Poe Reach - FYLF site ^_ Project Location TEHAMA COUNTY PLUMAS COUNTY BUTTE COUNTY Æÿ70Æÿ32 Æÿ89 Æÿ162 Æÿ49 Æÿ191 Æÿ99 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Cr e a t e d B y : A F r y j o f f H u n g D o c u m e n t P a t h : \ \ a z r g i s s t o r p 0 3 \ G I S _ P r o j e c t s \ C l i e n t \ G A N D A \ P G E \ F Y L F _ S u r v e y s \ 2 4 0 0 1 3 6 8 _ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 \ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 . a p r x Figure 3-8. 2024 Breeding and YOY Survey Results by Life Stage Site 3 Butte County, California 0 12 24 Meters 0 40 80 Feet 1 inch = 80 feet Scale 1:960 ± Project Location ^_ XW #*#* #* 3b3b North Fork Feather River Egg Mass !(Adult Female ")Adult Male XW Adult Unknown #*Juvenile #*Young of the Year Poe Reach - FYLF site ^_ Project Location TEHAMA COUNTY PLUMAS COUNTY BUTTE COUNTY Æÿ70Æÿ32 Æÿ89 Æÿ162 Æÿ49 Æÿ191 Æÿ99 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Cr e a t e d B y : A F r y j o f f H u n g D o c u m e n t P a t h : \ \ a z r g i s s t o r p 0 3 \ G I S _ P r o j e c t s \ C l i e n t \ G A N D A \ P G E \ F Y L F _ S u r v e y s \ 2 4 0 0 1 3 6 8 _ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 \ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 . a p r x Figure 3-9. 2024 Breeding and YOY Survey Results by Life Stage Sites 5 and 6 Butte County, California 0 40 80 Meters 0 130 260 Feet 1 inch = 260 feet Scale 1:3,120 ± Project Location ^_ !(!(!( ") ")") XWXW XWXWXW XW #*#*#* #*#* #* #* 6d6d 55 6c6c North F o r k F e a t h e r R i v e r Tri b u t a r y 6 Tri b u t a r y 5 Egg Mass !(Adult Female ")Adult Male XW Adult Unknown #*Juvenile #*Young of the Year Poe Reach - FYLF site ^_ Project Location TEHAMA COUNTY PLUMAS COUNTY BUTTE COUNTY Æÿ70Æÿ32 Æÿ89 Æÿ162 Æÿ49 Æÿ191 Æÿ99 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Cr e a t e d B y : A F r y j o f f H u n g D o c u m e n t P a t h : \ \ a z r g i s s t o r p 0 3 \ G I S _ P r o j e c t s \ C l i e n t \ G A N D A \ P G E \ F Y L F _ S u r v e y s \ 2 4 0 0 1 3 6 8 _ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 \ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 . a p r x Figure 3-10. 2024 Breeding and YOY Survey Results by Life Stage Sites 1 and 2 Butte County, California 0 50 100 Meters 0 175 350 Feet 1 inch = 350 feet Scale 1:4,200 ± Project Location ^_ XW XW !( 2c2c 2d2d 2a2a 2c2c 1b1b North F o r k F e a t h e r R i v e r Egg Mass !(Adult Female ")Adult Male XW Adult Unknown #*Juvenile #*Young of the Year Poe Reach - FYLF site ^_ Project Location TEHAMA COUNTY PLUMAS COUNTY BUTTE COUNTY Æÿ70Æÿ32 Æÿ89 Æÿ162 Æÿ49 Æÿ191 Æÿ99 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Cr e a t e d B y : A F r y j o f f H u n g D o c u m e n t P a t h : \ \ a z r g i s s t o r p 0 3 \ G I S _ P r o j e c t s \ C l i e n t \ G A N D A \ P G E \ F Y L F _ S u r v e y s \ 2 4 0 0 1 3 6 8 _ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 \ P o e _ F Y L F _ S u r v e y s _ 2 0 2 4 . a p r x Figure 3-11. Reach-wide YOY Survey Results in the Poe Reach from 2007 through 2024 0 400 800 Meters 0 1,200 2,400 Feet 1 inch = 3,000 feet Scale 1:36,000 ± Project Location ^_ Poe Powerhouse 2d2d 2a2a 4a4a 6d6d 4b4b 1b1b 7c7c 2c2c 4c4c 7b7b 7a7a 4d4d 55 33 6c6c Ro c k C r e e k Tributary 6 Tributary 5 Flea ValleyCreek Do g w ood Creek Cirb y Cree k Mill Creek LastChance Creek Camp Creek Heinz Creek No lto n Cre e k Nort h F o r k F ea t h e r Ri v e r South Branch MillCreek Ston y Cree k ConcowCreek Poe Dam ·|}þ70 2007-2024 FYLF Observations Poe Reach - FYLF site ^_ Project Location TEHAMA COUNTY PLUMAS COUNTY BUTTE COUNTY Æÿ70Æÿ32 Æÿ89 Æÿ162 Æÿ49 Æÿ191 Æÿ99 Butte County, California Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-18 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company 3.4 Water Temperature Monitoring Mean daily mainstem temperatures in the Poe Reach were around 14.7°C in late-May 2024, when FYLF breeding was initiated, and ranged from 13.9–20.3°C (mean=16.9°C) during the oviposition period (May 19–June 16). Mainstem temperatures peaked around 22.1°C beginning in mid-July before dropping below 20°C in late August (Figure 3-12). Typically, downstream, intra-reach warming occurs on the Poe Reach between sites 7 (upper) and 1 (lower), with daily mean temperatures on average 1°C warmer at Site 1 (Figure 3-12). Figure 3-12. Mean hourly water temperatures recorded with Onset Stowaway TidbiT® loggers in the upper (Site 7) and lower (Site 1) Poe Reach of the NFFR, 2024. Air temperatures were obtained from the Jarbo Gap weather station. The FYLF oviposition period (May 19–June 16) is represented by the shaded blue area. 3.5 Habitat Assessment Survey Habitat Assessment surveys were conducted on the Poe Reach on July 24, 2024 following the Protocol 2 Spill Recession period. No suitable FYLF breeding habitats were identified in any new areas outside of designated breeding sites during the Habitat Assessment Survey. Most sections of river outside of designated breeding sites within the Poe Reach are inundated where potential breeding habitat may have been present at lower base flow levels. Mean daily flows during habitat assessments were 335 cfs on June 22, 2020 (CD) and 467 cfs on July 24, 2024 (N). For the breeding Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-19 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company sites assessed and measured, nearly all were diminished in area when compared to 2020 assessments (Figure 3-13; PG&E 2020). Subsite lengths were not as impacted as subsite widths where shallower edgewater habitat was greatly reduced by inundation from higher flow and vegetation encroachment. The most notable differences in width and length measurements occurred at subsites 1b, 2a, 2c, 4d, 6c, 7a, 7b, 7c, and sites 3 and 5. Dense vegetation overgrowth at subsites 4a and 4b made previous 2020 boundary landmarks difficult to relocate during surveys and thus measurements for these two adjacent subsites were combined for 2020 and 2024 comparisons. *Subsite measurements combined. Figure 3-13. Habitat Assessment measurements recorded on June 22, 2020 and July 24, 2024 for Poe Reach FYLF designated breeding subsites. Mean Daily Flows during HAs were 335 cfs on June 22, 2020 (CD) and 467 cfs on July 24, 2024 (N). Overall, total FYLF breeding habitat was reduced by approximately 60 percent because of these factors (Figure 3-14). In 2020, total survey area for subsites combined was measured at approximately 12,564.5 square meters (m2); overall total survey area in 2024 for subsites combined measured approximately 5,034 m2, a 60 percent reduction in breeding habitat at base flow levels (Figure 3-14). Most notable differences in FYLF breeding habitat occurred at subsites 1b, 2c, 4d, 6c, 7a, 7b, 7c, and sites 3 and 5, though every designated breeding subsite in the Poe Reach was reduced. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 3.0 Results 3-20 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company *Subsite measurements combined. Figure 3-14. Total search area from Habitat Assessment measurements recorded on June 22, 2020 and July 24, 2024 for Poe Reach FYLF designated breeding subsites. Mean Daily Flows during HAs were 335 cfs on June 22, 2020 (CD) and 467 cfs on July 24, 2024 (N). Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 4.0 Discussion 4-1 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company 4.0 Discussion The number of egg masses (n= 57) on the Poe Reach in 2024 was relatively low (Table 3-2; Figure 3-1), however, a lambda value of 1.39 suggested an increasing population in comparison to 2023. Even so, egg mass numbers fell below the average (89.3 across years) in 2024. While the low number of egg masses in 2024 is typical of other Normal water years (e.g., 2003–2005, 2016, and 2018), one of the highest numbers of egg masses occurred in 2010 (n=150) which was also a Normal water year (Table 3-2). Critically Dry water years since the issuance of the new license have higher numbers of egg masses, but the overall decrease may be due to the higher base flows under the new license which have reduced habitat availability (figures 3-13 and 3-14) by partially or completely inundating suitable edgewater habitat at many of the known breeding sites (Appendix A; PG&E 2023b) or due to direct or indirect effects of the Camp, Dixie, and Bear wildfires. Although other Normal water year types have experienced longer breeding periods (e.g., 2010; Table 3-4), breeding has begun later in Normal water years and has had a shorter duration when compared to Dry and Critically Dry years (Table 3-4). The short breeding period (28 days) observed in 2024 was more in line with the mean for Wet water type years (25.2 days; Table 3-4) and may be indicative of a borderline designation between the two water year types. While these averages can suggest a pattern across years, water years have different characteristics that do not conform to the metric used to determine the water year type (i.e., the total amount of flow over a hydro-period), such as the magnitude, timing, and duration of higher and lower flows. For example, 2024 was considered an ‘aggressively normal’ water year because spring runoff flows were very high, similar to spring flows during a wet water year type. The number of YOY counted during the two reach-wide surveys in 2024 (n= 75) was lower than 2023 (n= 244), and also lower than most other Normal water years such as 2018 (n= 292) and 2016 (n= 226) though comparable to the Normal water year in 2010 (n= 101) (Table 3-5). The relatively low level of YOY recruitment observed may be due the missed October reach-wide survey (cancelled due to high operational flows), or other unknown factors, such as predation. 4.1 Scouring and Stranding of Egg Masses and Tadpoles in 2024 All scouring documented in 2024 occurred at sites 4 and 7 and was observed during the Protocol 2 Spill Recession. The only other site monitored during the spill recession was Subsite 1b and no egg masses or other FYLF life stages were observed at that subsite. Nine egg masses were recorded as partially or totally scoured in 2024 at subsites 4a, 4b, 4d, 7a, and 7b (figures 3-3 and 3-4; Photo 20, Appendix C; Appendix D). Scoured egg masses in previous years may have been attributed to the increased base flows under the new license making egg masses more vulnerable to scouring as they develop, particularly at the upper reach breeding sites 4 and 7 (PG&E 2021). In 2024, it was again noted during spill recession surveys that edgewater velocities increased at some subsites or in some locations within subsites during the flow reduction, likely causing egg masses to become scoured from the oviposition substrate. Scoured egg masses were found fully or partially detached from the oviposition substrate and one of those found scoured was later found stranded as spill recession flows receded (figures 3-3 and 3-4; Appendix D). It is important to note that since egg Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 4.0 Discussion 4-2 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company mass surveys began at Site 7 in 2020 as part of the new license implementation study, egg masses there have been scoured in Dry and Critically Dry years as well. In 2020 (Critically Dry), five egg masses were scoured from oviposition substrates and in 2022 (Dry), one egg mass became scoured at Site 7. A total of eight egg masses were stranded in 2024, all observed during the Protocol 2 Spill Recession surveys. This includes one observed on June 7 that was found scoured and stranded at Subsite 7b (Appendix D). As egg masses hatched and tadpoles developed, tadpole groups associated with documented egg masses or egg mass clusters were stranded at nine flow levels during the spill recession (Appendix D). Stranded tadpoles likely numbered in the thousands and USFWS permit delays prevented handling or salvage of live stranded tadpoles, except in the presence of Forest Service staff on June 6 when tadpoles were salvaged at Subsite 4a. A total of 27 tadpole stranding incidents were recorded within sites 4 and 7. Rough estimates of tadpoles observed alive in the edgewater or stranded and dead during the spill recession were recorded during surveys (Appendix D). However, it is important to note that these estimates can be problematic, as stranded tadpoles are very difficult to observe. While not comparable, it is possible that strandings may have been less dramatic during the Protocol 2 Spill Recessions of 2023 and 2024 considering other Normal and Wet water years when these rampdown protocols were not in place. For example, in 2006 and 2011 (both Wet) when the ramp-down of flows was more rapid and extreme, 61% and 31% of egg masses were found stranded, respectively, at established breeding sites. Data from future surveys will continue to document any egg mass scouring or stranding at sites 1, 4, and 7 and other breeding sites and may provide a better understanding of how a higher base flow regime and protocol recession ramp-down rates effect egg masses and developing tadpoles. Considering the apparent impacts of spill recession operations on FYLF breeding activities and tadpole development, more study is required to conclude that the spill recession is meeting the goal of the RRP to minimize Project operational impacts (including spill management, spill recession, ramping rates, and outages) to aquatic species (see Recommendations). 4.2 Egg Masses Laid in Tributaries In 2024, one egg mass was laid in an unnamed tributary leading to Site 3. The oviposition site in the unnamed tributary was found approximately 175 m upstream of Site 3 near the Bardees Bar Road crossing (Figure 3-8), the same location as one found in 2023. A total of 16 egg masses have been observed in tributaries since surveys began in 2003; of these, 11 (69%) were laid during Wet water years. Egg masses have been observed in Flea Valley Creek, Tributary 5, Tributary 6, two unnamed tributaries near Site 3, and Mill Creek. Oviposition sites in tributaries have ranged from 10 to 850 m distance from the confluence with the mainstem river. 4.3 Habitat Assessments In 2020, a Critically Dry water year, the total survey area for subsites combined was measured at approximately 12,564.5 m2, whereas the overall total survey area in 2024 (a Normal water year) for subsites combined measured approximately 5,034 m2, a 60 percent reduction in breeding Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 4.0 Discussion 4-3 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company habitat at base flow levels (Figure 3-14). Much of this loss is due to cobble bar inundation from higher base flows, deeper edgewater, and heavy encroachment of vegetation (Photos 1–17, Appendix C). 4.4 Wildfires No wildfires occurred in the Poe Reach in 2024; however, the effects of recent fires (Dixie, Camp, and Bear) continue to impact tributary and river habitats. In 2023, several larger landslides, rockslides, and small avalanches in the upper reaches of the NFFR, usually initiated by heavy precipitation events within the burn scars, caused thick plumes of sediment and debris to move downstream into the mainstem Poe Reach (PG&E 2024). As a result, egg masses and tadpole groups at all subsites experienced some degree of light to heavy siltation in 2023. Additionally, survey conditions continued to deteriorate in Tributary 5 since the Camp Fire, with a loss of overstory, downed trees, and increasingly dense understory growth that requires substantial hand clearing to gain access. These survey conditions make frogs more difficult to detect. Other FYLF- occupied tributaries that were burned during the 2018 Camp Fire are likely experiencing similar conditions (PG&E 2020b). Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 5.0 Recommendations 5-1 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company 5.0 Recommendations • Following monitoring requirements in the Plan, continue annual monitoring surveys on the Poe Reach using the same methodology, which focuses on egg mass counts in the spring as an index of the breeding female population size and recruitment success during fall YOY surveys. These surveys will provide the Agencies with the data necessary to evaluate: 1) the effects of base flows on breeding habitat and YOY recruitment and 2) the effects of spill recession flows, particularly during Wet and Normal years. • Consider combining Subsite 4a and Subsite 4b into a single, continuous survey area (Subsite 4ab). Dense vegetation covering previous boundary landmarks made measurements difficult and inconsistent with those from 2020. Since subsites are immediately adjacent, this would not interfere with long-term data analysis. • Continue to support the Forest Service and the California Department of Transportation (Caltrans) efforts to improve culvert under-crossings of Highway 70 to enhance FYLF movement between tributary refugia and the mainstem NFFR. • Continue to support the development and processes of the RRP in reducing the effects of ramping operations on FYLF breeding and survival. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 6.0 References 6-1 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company 6.0 References California Fish and Game Commission. 2020. Notice of Findings for Foothill Yellow-legged Frog (Rana boylii), March 10, 2020. https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=177905&inline Ecological Resources Committee (ERC). 2009. Rock Creek–Cresta Project FERC No. 1962 Ecological Resources Committee Annual Report on 2008 Operation and Monitoring License Condition 22 and Annual Water Temperature Monitoring Report License Condition 4.C. May 28, 2009. Federal Energy Regulatory Commission (FERC). 2018. Order Issuing New License. Project Nos. 2107-016. Prepared by Federal Energy Regulatory Commission, Office of Energy Projects, Division of Hydropower Licensing. Washington, DC. December 17, 2018. Garcia and Associates (GANDA). 2003. Results of 2000-2002 surveys for Foothill yellow-legged frogs (Rana boylii) within the Poe Powerhouse Project Area, North Fork Feather River. Report to Pacific Gas and Electric Company, San Ramon, CA. Gosner, K. L. 1960. A simplified table for staging anuran embryos and larvae with notes on identification. Herpetologica 16:183-190. Marlow, K. R., K. D. Wiseman, C. A. Wheeler, J. E. Drennan, and R. E. Jackman. 2016. Identification of Individual Foothill Yellow-Legged Frogs (Rana boylii) using Chin Pattern Photographs: a Non-Invasive and Effective Method for Small Population Studies. Herpetological Review 47(2):193-198. Pacific Gas and Electric Company (PG&E). 2003. Results of 2002 Study for Evaluating the Availability, Extent, and Quality of Foothill Yellow-legged Frog (Rana boylii) Habitat Within the Poe Reach at the Existing Flow Level and at Four Higher Flows. Report by Garcia and Associates (GANDA) and Pacific Gas and Electric Co., San Ramon, California. Pacific Gas and Electric Company (PG&E). 2004. Results of 2004 Study Evaluating Impacts of Elevated Flows on Foothill Yellow-Legged Frog (Rana boylii) Habitat in the Poe Reach, North Fork Feather River. Report by Garcia and Associates (GANDA) and Pacific Gas and Electric Co., San Ramon, California. Pacific Gas & Electric Company (PG&E). 2020a. Poe Amphibian Monitoring Plan. February 2020. Approved by FERC November 24, 2020). Pacific Gas & Electric Company (PG&E). 2020b. Results of 2019 Surveys for Foothill Yellow- legged Frog (Rana boylii) on the Cresta and Poe Reaches of the North Fork Feather River. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report 6.0 References 6-2 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Report by Garcia and Associates (GANDA) and Pacific Gas and Electric Co., San Ramon, California. Pacific Gas & Electric Company (PG&E). 2021. Results of 2020 Surveys for Foothill Yellow- legged Frog (Rana boylii) on the Poe Reach of the North Fork Feather River. Report by Kleinfelder and Pacific Gas and Electric Co., San Ramon, California. Pacific Gas & Electric Company (PG&E). 2023a. Poe Hydroelectric Project FERC Project No. 2107-CA Long-Term Ramping Rate Plan. Approved by FERC March 27, 2023. Pacific Gas & Electric Company (PG&E). 2023b. Results of 2022 Surveys for Foothill Yellow- legged Frog (Rana boylii) on the Poe Reach of the North Fork Feather River. Report by Kleinfelder and Pacific Gas and Electric Co., San Ramon, California. Pacific Gas & Electric Company (PG&E). 2024. Results of 2023 Surveys for Foothill Yellow- legged Frog (Rana boylii) on the Poe Reach of the North Fork Feather River. Report by Kleinfelder and Pacific Gas and Electric Co., San Ramon, California. Seltenrich, C. P., and A. C. Pool. 2002. A Standardized Approach for Habitat Assessments and Visual Encounter Surveys for the Foothill Yellow-legged Frog (Rana boylii). May 2002. Pacific Gas and Electric Company, Technical and Ecological Services, unpublished report. U.S. Fish and Wildlife Service. 2023. Endangered and Threatened Wildlife and Plants; Foothill Yellow-Legged Frog; Threatened Status with Section 4(d) Rule for Two Distinct Populations Segments and Endangered Status for Two distinct Populations Segments. Accessed at: https://www.federalregister.gov/documents/2023/08/29/2023-17675/endangered-and- threatened-wildlife-and-plants-foothill-yellow-legged-frog-threatened-status-with Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix A May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Appendix A: Minimum Instream River Flow Schedule (Table 1), First Five-year Period for the Poe Reach SWRCB (WQC, Condition 1, Issued December 29, 2017) Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Project No. 2107-016 - 53 - APPENDIX A CALIFORNIA STATE WATER RESOURCES CONTROL BOARD Water Quality Certification Conditions Filed December 29, 2017 Condition 1. Minimum Instream Flows Within 60 days of license issuance, the Licensee shall operate according to the minimum instream flows specified in Table 1 as measured at USGS gage No. 11404500 (Gage 23).69 Flows shall be measured as both a 24-hour average (mean daily) and an instantaneous reading. Instantaneous flows are used to construct the average daily flow value and shall be measured in time increments of not more than 15-minutes. Mean daily flows shall be 24-hour averages of the instantaneous readings from midnight of one day to midnight of the next day. The Licensee shall record instantaneous streamflow as required by USGS standards. Instantaneous flow measurements shall be at least 90 percent of the minimum flow listed in Table 1. Mean daily flows shall be equal to or greater than the minimum flows listed in Table 1. Table 1. Minimum Instream Releases (cfs) from Poe Dam as measured at Gage 231 Month Water Year Type2 Wet Normal Dry Critically Dry 69 Gage 23 is also known as NF 23, and is owned and operated by PG&E. 20181217-3018 FERC PDF (Unofficial) 12/17/2018 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Project No. 2107-016 - 54 - Table 1. Minimum Instream Releases (cfs) from Poe Dam as measured at Gage 231 Month Water Year Type2 Wet Normal Dry Critically Dry 1 2 The minimum instream flow requirements are subject to temporary modification if required by equipment malfunction, as directed by law enforcement authorities or by FERC, or in emergencies. An emergency is defined as an unforeseen event that is reasonably out of the control of the Licensee and requires the Licensee to take immediate action, either unilaterally or under instruction by law enforcement or other regulatory agency staff, to prevent imminent loss of human life or substantial property damage. An emergency may include, but is not limited to: natural events such as landslides, storms, or wildfires; malfunction or failure of Project works; and recreation accidents. When possible the Licensee shall notify the Deputy Director prior to any temporary stream flow modification. In all instances, the Licensee shall notify the Deputy Director within 24 hours of any temporary stream flow modification. Within 96 hours of the temporary stream flow modification, the Licensee shall provide the Deputy Director with an update of the conditions associated with the modification and an estimated timeline for returning to the required minimum instream flows. Within 30 days of any temporary stream flow modification, the Licensee shall provide the Deputy Director with: (1) photo documentation of the emergency or reason for the stream flow modification; (2) a written description of the modification and its necessity; (3) an updated timeline for returning to the required minimum instream flows or timeline when the minimum instream flows resumed; and (4) a plan to prevent the need for modification of minimum instream flows resulting from a similar emergency in the future. 20181217-3018 FERC PDF (Unofficial) 12/17/2018 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix B May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Appendix B: Summary of the 2024 Visual Encounter Breeding Survey Results for Foothill Yellow-legged Frog on the Poe Reach of the North Fork Feather River Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix B B-1 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Table 1. Summary of FYLF VES and Spill Recession Surveys on the Poe Reach – 2024. DATE SUBSITE Channel H20 TEMP (◦C) CFS* AD MALE FEMALE 1 AD UNK2 JUV EM COMMENTS G S U 4/11/24 1b - 1,914 - - - - - - - Not surveyed. Inaccessible. 4/23/24 1b - 3,702 - - - - - - - Not surveyed. Inaccessible. 5/16/24 1b - 2,100 - - - - - - - Not surveyed. Inaccessible. 5/30/24 1b 15 1,220 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses observed. 6/5/24 1b 19 1,226 0 0 0 0 0 0 0 No FYLF or egg masses observed. 6/6/24 1b 20 1,114 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses observed. 6/7/24 1b 18 1,013 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses observed. 6/8/24 1b 19 915 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses observed. 6/12/24 1b 20 818 0 0 0 0 0 0 0 SPILL RECESSION and VES-No FYLF or egg masses observed. 6/17/24 1b 18 694 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses observed. 6/18/24 1b 17 625 0 0 0 0 0 0 0 SPILL RECESSION and VES-No FYLF or egg masses observed. 6/25/24 1b 19 505 0 0 0 0 0 0 0 SPILL RECESSION and VES-No FYLF or egg masses observed. 6/26/24 1b 21 449 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses observed. Subtotals 0 0 0 0 0 0 0 4/11/24 2a - 1,914 - - - - - - - Not surveyed. Inaccessible. 6/25/24 2a 20 505 0 0 0 0 0 0 0 No FYLF or egg masses observed. Subtotals 0 0 0 0 0 0 0 4/11/24 2c - 1,914 - - - - - - - Not surveyed. Inaccessible. 4/23/24 2c - 3,702 - - - - - - - Not surveyed. Inaccessible. 5/16/24 2c - 2,100 - - - - - - - Not surveyed. Inaccessible. 6/5/24 2c 19 1,226 0 0 0 0 0 0 1 One egg mass observed. 6/19/24 2c 18 628 0 0 0 0 1 0 0 No new egg masses observed. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix B B-2 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company DATE SUBSITE Channel H20 TEMP (◦C) CFS* AD MALE FEMALE 1 AD UNK2 JUV EM COMMENTS G S U 6/25/24 2c 20 505 0 0 0 0 0 0 0 No new egg masses observed. One incidental unknown frog observed downstream of site. Subtotals 0 0 0 0 1 0 1 4/11/24 2d - 1,914 - - - - - - - Not surveyed. Inaccessible. 6/12/24 2d 22 818 0 0 0 0 0 0 0 observed. 6/19/24 2d 18 628 0 0 0 0 0 0 0 FYLF or egg masses observed. 6/25/24 2d 505 0 0 0 0 0 0 0 No FYLF or egg masses observed. Subtotals 0 0 0 0 0 0 0 4/11/24 3 12 1,914 0 0 0 0 0 0 0 No FYLF or egg masses observed. 4/23/24 3 11.5 3,702 0 0 0 0 0 1 0 No egg masses observed. Juvenile observed in culvert pool in unnamed tributary. 5/29/24 3 16 1,323 0 0 0 0 0 1 1 mass in unnamed tributary. No FYLF or egg 6/5/24 3 16.5 1,226 0 0 0 0 1 0 0 No new egg masses observed. Tributary pool dried up. No tadpoles observed. Subtotals 0 0 0 0 1 2 1 4/11/24 4a 10.5 1,914 1 0 0 0 0 0 0 No egg masses observed 4/23/24 4a - 3,702 - - - - - - - Not surveyed. Inaccessible. 5/16/24 4a 13.5 2,100 1 0 0 0 0 0 0 No egg masses observed 5/29/24 4a 16 1,323 5 0 0 0 1 0 4 Four egg masses observed. Many males calling. 5/30/24 4a 15 1,220 4 2 0 0 1 0 5 SPILL RECESSION-Five new egg masses observed. One amplexing pair observed. 6/5/24 4a 17 1,226 3 0 0 0 0 0 6 6/6/24 4a 17.5 1,114 3 0 0 0 1 0 1 SPILL RECESSION-One new egg mass 6/7/24 4a 18.5 1,013 0 0 0 0 0 0 0 6/8/24 4a 19 915 1 0 0 0 0 0 0 SPILL RECESSION-No new egg mass observed. Two previous egg masses stranded. 6/12/24 4a 19 818 1 0 0 0 0 0 0 masses observed. Most previous egg masses hatched or hatching. Two hatching egg masses Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix B B-3 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company DATE SUBSITE Channel H20 TEMP (◦C) CFS* AD MALE FEMALE 1 AD UNK2 JUV EM COMMENTS G S U 6/17/24 4a 19 694 2 0 0 0 0 0 0 observed. Most previous egg masses hatched or hatching. Tadpoles from one previous egg 6/18/24 4a 18 625 0 0 0 0 0 0 0 masses observed. 6/19/24 4a 17 628 0 0 0 0 0 0 0 No FYLF or new egg masses observed. Tadpoles present near many egg mass sites. 6/20/24 4a 17.5 577 0 0 0 0 0 0 0 observed. Stranded tadpoles from various egg masses observed. 6/25/24 4a 19 505 0 0 0 0 0 0 0 SPILL RECESSION and VES-No new egg masses observed. 6/26/24 4a 19 449 0 0 0 0 0 0 0 observed. Stranded oviposition sites from Subtotals 21 3 0 0 3 0 16 4/11/24 4b 11 1,914 0 0 0 0 0 0 0 No FYLF or egg masses observed. 5/7/24 4b 10.5 2,358 2 2 0 0 4 0 0 5/16/24 4b 13.5 2,100 0 0 0 0 0 0 0 No FYLF or egg masses observed. 5/30/24 4b 15 1,220 1 0 0 0 3 0 0 observed. 6/5/24 4b 17.5 1,226 0 0 0 0 0 0 1 One new tadpole group infers egg mass not previously observed. 6/6/24 4b 17.5 1,114 1 0 0 0 0 0 0 SPILL RECESSION-No new egg masses observed. 6/7/24 4b 18.5 1,013 0 0 0 0 0 0 1 inferred from tadpole group not previously 6/8/24 4b 19 915 0 0 0 0 0 0 0 SPILL RECESSION-No new egg masses observed. 6/12/24 4b 19 818 0 0 0 0 0 0 6 masses inferred from distinct tadpole groups. 6/17/24 4b 17.5 694 0 0 0 0 0 0 0 SPILL RECESSION-No new egg masses observed. 6/18/24 4b 18 625 0 0 0 0 0 0 0 6/19/24 4b 17 628 0 0 0 0 0 0 0 No FYLF or new egg masses observed. Tadpoles present near some egg mass sites. 6/20/24 4b 16.5 577 0 0 0 0 0 0 0 observed. One previous tadpole group 6/25/24 4b 19 505 0 0 0 0 0 0 1 SPILL RECESSION and VES - One new tadpole group not previously observed infers one new egg mass. 6/26/24 4b 18 449 0 0 0 0 0 0 0 observed. One previous tadpole group stranded. Subtotals 4 3 0 0 10 0 10 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix B B-4 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company DATE SUBSITE Channel H20 TEMP (◦C) CFS* AD MALE FEMALE 1 AD UNK2 JUV EM COMMENTS G S U 4/11/24 4c 10 1,914 0 0 0 0 0 0 0 No FYLF or egg masses observed. 5/7/24 4c 10.5 2,358 1 0 0 0 2 1 0 No egg masses observed. 5/30/24 4c 18.5 1,220 0 0 0 0 1 1 0 SPILL RECESSION-No egg masses observed. 6/5/24 4c 17 1,226 0 0 0 0 0 0 1 6/6/24 4c 1,114 0 0 0 0 0 0 0 SPILL RECESSION-No new egg masses observed. Original tadpole group location stranded, but tads observed in nearby edgewater. 6/7/24 4c 1,013 0 0 0 0 0 0 0 6/8/24 4c 915 0 0 0 0 0 0 0 observed. No stranded tadpoles observed. 6/12/24 4c 20 818 0 0 0 0 0 0 3 SPILL RECESSION and VES-Three new egg masses inferred from distinct tadpole groups. Portion of previous tadpole group stranded in isolated pool. 6/17/24 4c 18.5 694 0 0 0 0 0 0 0 SPILL RECESSION-No new egg masses observed. 6/18/24 4c 17.5 625 0 0 0 0 0 0 0 masses observed. One previous tadpole group 6/19/24 4c 17 628 0 0 0 0 0 0 0 No FYLF or new egg masses observed. 6/20/24 4c 17 577 0 0 0 0 0 0 0 SPILL RECESSION-No new egg masses observed. One previous tadpole group likely to strand at next flow level. 6/25/24 4c 18 505 0 0 0 0 0 0 0 masses or tadpole groups observed. One 6/26/24 4c 18 449 0 0 0 0 0 0 0 SPILL RECESSION-No new egg masses or tadpole groups observed. Subtotals 3 0 0 0 3 3 4 4/11/24 4d - 1,914 - - - - - - - No survey. Inaccessible. 5/29/24 4d 15.5 1,323 0 0 0 0 0 0 2 partially desiccated, likely from partial 5/30/24 4d 15 1,220 1 0 0 0 0 3 0 6/6/24 4d 17.5 1,114 3 0 0 0 0 2 1 6/7/24 4d 19 1,013 1 0 0 0 0 0 0 observed. A portion of tadpoles from previous egg mass stranded and desiccated. 6/8/24 4d 18.5 915 1 0 0 0 0 0 0 SPILL RECESSION-No new egg masses observed. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix B B-5 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company DATE SUBSITE Channel H20 TEMP (◦C) CFS* AD MALE FEMALE 1 AD UNK2 JUV EM COMMENTS G S U 6/12/24 4d 20 818 1 0 0 0 0 0 0 masses observed. One previous egg mass intact 6/17/24 4d 18 694 0 0 0 0 0 0 0 SPILL RECESSION-No new egg masses observed. One previous egg mass hatched. 6/18/24 4d 18 625 0 0 0 0 0 0 0 masses observed. 6/20/24 4d 17 577 0 0 0 0 0 1 0 observed. Tadpoles near two egg mass sites 6/25/24 4d 18 505 0 0 0 0 0 0 1 SPILL RECESSION and VES-One new tadpole group not previously observed infers one new egg mass. Stranded tadpoles near previous egg mass site. 6/26/24 4d 19 449 0 0 0 0 0 0 0 SPILL RECESSION-No new egg masses or tadpole groups observed. Subtotals 8 0 0 0 0 7 4 4/11/24 5 - 1,914 - - - - - - - Veg clearing in Trib 5. No survey. Inaccessible. 4/23/24 5 13.5 3,702 0 2 0 0 1 11 0 5/7/24 5 12 2,358 0 0 0 0 0 9 0 mainstem survey. Complete tributary survey 5/16/24 5 15 2,100 1 3 0 0 9 6 0 All but one FYLF observed in Tributary 5. No egg masses observed at Site 5. 5/29/24 5 14 1,323 0 0 2 0 5 7 0 and one juvenile observed at Site 5. No egg masses observed. All other FYLF observed on 6/5/24 5 19 1,226 0 0 0 0 2 12 0 No egg masses observed. All but one FYLF observed in Tributary 5. 6/12/24 5 21 818 1 0 0 2 3 1 2 Two egg masses inferred from two distinct tadpole groups on mainstem. Two females and one unknown observed on Tributary 5. One dead male observed. 6/19/24 5 18 628 0 0 1 2 1 0 1 not previously observed. All FYLF observed on Tributary 5. 6/25/24 5 19.5 505 0 0 1 5 9 2 0 No new egg masses or tadpole groups observed. All but two FYLF observed on Tributary 5. 7/24/24 5 0 0 0 3 2 0 0 Subtotals** 2 5 4 12 32 48 3 4/11/24 6c - 1,914 - - - - - - - Not surveyed. Inaccessible. 6/12/24 6c 21.5 818 1 0 0 0 1 0 2 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix B B-6 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company DATE SUBSITE Channel H20 TEMP (◦C) CFS* AD MALE FEMALE 1 AD UNK2 JUV EM COMMENTS G S U 6/19/24 6c 18 628 0 0 0 0 0 0 0 No FYLF or new egg masses observed. 6/25/24 6c 18 505 0 0 0 0 0 0 0 Stranded tads observed near previous egg mass Subtotals 2 0 0 0 1 0 3 4/11/24 6d - 1,914 - - - - - - - Not surveyed. Inaccessible. 4/23/24 6d - 3,702 - - - - - - - Not surveyed. Inaccessible. 5/16/24 6d - 2,100 - - - - - - - Not surveyed. Inaccessible. 6/5/24 6d 19 1,226 0 0 0 0 0 0 0 6/19/24 6d 18 628 0 0 0 0 0 0 0 No FYLF or egg masses observed. Subtotals 0 0 0 0 0 0 0 4/11/24 7a 10 1,914 0 0 0 0 0 0 0 No FYLF or egg masses observed. 5/7/24 7a 10 2,358 0 0 0 0 0 0 0 No FYLF or egg masses observed. 5/29/24 7a 16 1,323 0 0 0 0 0 0 0 No FYLF or egg masses observed. 5/31/24 7a 16 1,210 1 3 0 0 0 0 0 SPILL RECESSION-No egg masses observed. 6/5/24 7a 18.5 1,226 0 0 0 0 0 0 4 Four egg masses observed. 6/6/24 7a 18 1,114 0 0 0 0 0 0 0 6/7/24 7a 18.5 1,013 0 0 1 0 0 0 1 SPILL RECESSION-One new egg mass observed. 6/8/24 7a 19 915 0 0 0 0 0 0 0 6/12/24 7a 20.5 818 0 0 0 0 0 0 0 masses observed. Previous egg masses hatched or hatching. 6/17/24 7a 20 694 0 0 0 0 0 0 0 6/18/24 7a 18 625 0 0 0 0 0 0 0 6/20/24 7a 18 577 0 0 0 0 0 0 0 observed. Stranded tadpoles found in small, isolated pool near egg mass cluster. 6/25/24 7a 19 505 0 0 0 0 0 0 0 SPILL RECESSION and VES-No new egg masses observed. Previous egg masses hatched or hatching. 6/26/24 7a 20 449 0 0 0 0 0 0 0 SPILL RECESSION-No new egg masses or tadpole groups observed. Stranded tadpoles near previous egg mass sites. Subtotals 1 3 1 0 0 0 6 4/11/24 7b - 1,914 - - - - - - - Not surveyed. Inaccessible. 5/7/24 7b - 2,358 - - - - - - - Not surveyed. Inaccessible. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix B B-7 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company DATE SUBSITE Channel H20 TEMP (◦C) CFS* AD MALE FEMALE 1 AD UNK2 JUV EM COMMENTS G S U 5/29/24 7b - 1,323 - - - - - - - Not surveyed. Inaccessible. 5/31/24 7b 16 1,210 0 0 0 0 0 0 2 6/6/24 7b 19 1,114 0 0 0 0 0 0 0 observed. Two previous egg masses 6/7/24 7b 18 1,013 0 0 0 0 0 0 2 SPILL RECESSION-Two new egg masses observed. One found scoured and both stranded. 6/8/24 7b 19 915 0 0 0 0 0 0 1 SPILL RECESSION-One new egg mass observed stranded and not viable. 6/12/24 7b 20.25 818 0 0 0 0 0 0 0 6/17/24 7b 18 694 0 0 0 0 0 0 0 SPILL RECESSION and VES-No new egg masses observed. 6/18/24 7b 17.5 625 0 0 0 0 0 0 2 SPILL RECESSION and VES-Two new egg 6/19/24 7b 17.5 628 1 0 0 0 1 0 2 was inferred from a tadpole group not previously found. Previous egg masses from 6/20/24 7b 17 577 0 0 0 0 0 0 0 masses observed. Many tadpoles from 6/25/24 7b 18 505 0 0 0 1 0 0 0 SPILL RECESSION and VES-No new egg masses observed. Previous egg masses still intact and developing. 6/26/24 7b 19.5 449 0 0 0 0 0 0 0 SPILL RECESSION and VES-No new egg masses observed. Previous egg masses still intact and developing. Stranded tadpoles observed along bank. Subtotals 1 0 0 1 1 0 9 5/31/24 7c 18 1,210 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses observed; subsite accessibility very limited. 6/5/24 7c 17.5 1,226 0 0 0 0 0 0 0 No FYLF or egg masses observed. Site mostly inundated at this flow level. 6/6/24 7c 18.5 1,114 0 0 0 0 0 0 0 6/7/24 7c 17.5 1,013 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses observed; subsite mostly inundated. 6/8/24 7c 18 915 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses 6/12/24 7c 20.5 818 0 0 0 0 0 0 0 SPILL RECESSION and VES-No FYLF or egg masses observed; subsite has high velocity flows and is heavily vegetated. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix B B-8 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company DATE SUBSITE Channel H20 TEMP (◦C) CFS* AD MALE FEMALE 1 AD UNK2 JUV EM COMMENTS G S U 6/17/24 7c 17.5 694 0 0 0 0 0 0 0 observed. Previous habitat conditions have not 6/18/24 7c 17 625 0 0 0 0 0 0 0 SPILL RECESSION and VES-No FYLF or egg masses observed. Previous habitat 6/19/24 7c 17.5 628 0 0 0 0 0 0 0 change in habitat conditions. 6/20/24 7c 17.5 577 0 0 0 0 0 0 0 SPILL RECESSION-No FYLF or egg masses observed. Previous habitat conditions have not improved. 6/25/24 7c 18 505 0 0 0 0 0 0 0 6/26/24 7c 18 449 0 0 0 0 0 0 0 Subtotals 0 0 0 0 0 0 0 Poe Reach Totals 42 14 5 13 52 60 57 *Flow information obtained from Rock Creek Switching operator Cond=condition: G=gravid, S=spent (i.e. egg laid), U=Too small to determine breeding condition Unknown adults were frogs that were not captured **Totals include Tributary 5 observations in Site 5 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Appendix C: Representative Photographs of the 2024 Surveys for Foothill Yellow-legged Frog on the Poe Reach of the North Fork Feather River Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-1 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 1. Subsite 1b, view from left bank looking upstream, 1,964 cfs. May 16, 2024. Photo KDW29 Photo 2. Subsite 2a, bottom of site, looking towards the back of the pool tailout, 660 cfs. June 19, 2024. Photo KDW44 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-2 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 3. Subsite 2c, bottom of site, view upstream from right bank, 660 cfs. June 19, 2024. Photo KDW43 Photo 4. Subsite 2c, top of site, view downstream from left bank, 660 cfs. June 19, 2024. Photo KDW42 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-3 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 5. Subsite 2d, bottom of site, view upstream, 532 cfs. June 25, 2024. Photo KDW70 Photo 6. Site 3, top of site, view downstream, 1,965 cfs. May 7, 2024. Photo KDW77 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-4 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 7. Subsite 4a, bottom of site, view upstream, 467 cfs. July 24, 2024. Photo KRM3F7 Photo 8. Subsite 4b, at the Flea Valley Creek confluence, view upstream, 1,964 cfs. May 16, 2024. Photo KDW25 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-5 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 9. Subsite 4c, bottom of site, view upstream, 807 cfs. June 12, 2024. Photo KRM430 Photo 10. Subsite 4d, bottom of site, view upstream, 723 cfs. June 17, 2024. Photo KRM506 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-6 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 11. Site 5, bottom of site, view upstream, 660 cfs. June 19, 2024. Photo KDW11 Photo 12. Subsite 6c, bottom of site, view upstream, 660 cfs. June 19, 2024. Photo KDW27 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-7 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 13. Subsite 6d, bottom of site, view upstream, 660 cfs. June 19, 2024. Photo KDW25 Photo 14. Subsite 7a, side channel pool, view upstream, 1,964 cfs. May 16, 2024. Photo KDW80 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-8 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 15. Subsite 7a, bottom of mainstem portion of subsite, view upstream, 466 cfs. July 24, 2024. Photo KRM30 Photo 16. Subsite 7b, top of site, view upstream, 1,166 cfs. May 31, 2024. Photo KDW07 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-9 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 17. Subsite 7c, bottom of site, view upstream, 1,166 cfs. May 31, 2024. Photo KDW200 Photo 18. Egg mass “A” at Subsite 2c, laid when flows in the Poe reach were approximately 1,254 cfs. June 5, 2024. Photo KDW49 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-10 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 19. Egg mass “A” at Subsite 4d, at Gosner stage 7, laid when flows in the Poe reach were approximately 1,267 cfs. May 29, 2024. Photo KRM67 Photo 20. Egg mass “H” at Subsite 7b, at Gosner stage 13, found scoured and tangled in an emergent willow at 609 cfs on June 20, 2024. Photo KRM54 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-11 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 21. Two cohorts of FYLF tadpoles located at Site 5. June 19, 2024. Photo KDW18 Photo 22. A four-legged FYLF tadpole (20 mm SUL) observed at Subsite 7b. September 5, 2024. Photo KDW59 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix C C-12 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Photo 23. A young-of-the-year (YOY) FYLF observed upstream of Subsite 4c. September 5, 2024. Photo KDW74 Photo 24. A pair of FYLF underwater in amplexus, Subsite 4a. May 30, 2024. Photo KDW73 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Appendix D: Summary Table and Representative Photographs for Protocol 2 Spill Recession Foothill Yellow-legged Frog Surveys at Site 4, Site 7, and Subsite 1b on the Poe Reach of the North Fork Feather River Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-1 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 5/30/2024 1 1,173 4a-A 14 0.72 3 9 16.5 Gosner 13 when found on 5/29 6/6/2024 8 1,077 4a-A -0.6 - - 26 X X X Stranded in isolated pool; unknown # of fresh tads dead; some rescued. 6/7/2024 9 976 4a-A -1.7 - - - X Unknown # of small tads in shallow water near oviposition site. 6/8/2024 10 881 4a-A -2.15 - - - 6/12/2024 14 807 4a-A -2 - - - X X Fully stranded; ~10 tads dead. 6/17/2024 19 724 4a-A -2.74 - - - 6/20/2024 22 610 4a-A -2.8 - - - 6/25/2024 27 532 4a-A -3.29 - - - 6/26/2024 28 493 4a-A -3.3 - - - 5/30/2024 1 1,173 4a-B 20 0.72 5 10 16.5 Gosner 19 when found on 5/29. 6/6/2024 8 1,077 4a-B -1.05 - - 26 X X X Stranded in isolated pool; unknown # of fresh tads dead; some rescued, including remaining jelly with larval tads. 6/7/2024 9 976 4a-B -1.6 - - 6/8/2024 10 881 4a-B -2.05 - - - X X Re-stranded at "rescue" location; approximately 50 dead tadpoles. 6/12/2024 14 807 4a-B -2.1 - - - 6/17/2024 19 724 4a-B -2.58 - - - 6/18/2024 20 672 4a-B -2.75 - - - 6/20/2024 22 610 4a-B -2.65 - - - 6/25/2024 27 532 4a-B -3.32 - - - 6/26/2024 28 493 4a-B -3.4 - - - 5/30/2024 1 1,173 4a-C 13 0 6 15 16 6/6/2024 8 1,077 4a-C 0.01 5 10 19 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-2 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/7/2024 9 976 4a-C 0 - 0.3 18.5 Hatched. Black tadpoles. 6/8/2024 10 881 4a-C -0.15 - - - X Portion of mass stranded. Starting to hatch with 1 larval tad in water. 6/12/2024 14 807 4a-C -0.68 - - - 6/17/2024 19 724 4a-C -0.95 - - - 6/18/2024 20 672 4a-C -1.2 - - - X X 6/25/2024 27 532 4a-C -2.58 - - - 6/26/2024 28 493 4a-C -2.1 - - - 5/30/2024 1 1,173 4a-D 10 1.05 21 26 16 Gosner 8 when found on 5/29. 6/6/2024 8 1,077 4a-D 1.1 - 21 19 X Scoured on 6/5/24. 6/7/2024 9 976 4a-D 0.5 - 18 18 6/8/2024 10 881 4a-D 0.24 - 16 18 6/17/2024 19 724 4a-D 0.14 - 0.3 20 X ~20 tads in edgewater. 6/18/2024 20 672 4a-D 0.12 - 2 19 X cluster of F, M, N, D; EM 4a-D was 6/20/2024 22 610 4a-D 0 - - - X cluster of F, M, N, D; EM 4a-D was 6/25/2024 27 532 4a-D -0.39 - - - 6/26/2024 28 493 4a-D -0.75 - - - 5/30/2024 1 1,173 4a-E 9 1.56 12 16.5 16 New egg mass. 6/6/2024 8 1,077 4a-E 2.1 4 10 19 6/7/2024 9 976 4a-E 1.27 3 8 18.5 6/8/2024 10 881 4a-E 0 0.5 0.5 - X Stranded EM. 6/12/2024 14 807 4a-E -0.2 - - - 6/17/2024 19 724 4a-E -0.34 - - - X ~30 tads in edgewater. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-3 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/18/2024 20 672 4a-E -0.3 - - - 6/20/2024 22 610 4a-E -0.3 - - - 6/25/2024 27 532 4a-E Flag not found during survey. 6/26/2024 28 493 4a-E -0.85 - - - 5/30/2024 1 1,173 4a-F 19 2.28 28 47 16 New egg mass. 6/6/2024 8 1,077 4a-F 1.45 38 47 18.5 6/7/2024 9 976 4a-F 0.9 35 43 18 6/12/2024 14 807 4a-F 0.71 - 32 19 6/17/2024 19 724 4a-F 0.68 - 0.31 20 X 6/18/2024 20 672 4a-F 0.55 - 27 18 X 6/20/2024 22 610 4a-F 0.35 - 20 17 X 6/25/2024 27 532 4a-F 0.35 - 17 19 6/26/2024 28 493 4a-F 0.3 - 13 19 5/30/2024 1 1,173 4a-G 12 2.2 41 51 16 New egg mass. 6/6/2024 8 1,077 4a-G 1.11 19 33 18.5 X Scoured on 6/5/24. 6/7/2024 9 976 4a-G 0.9 - 39 18 6/8/2024 10 881 4a-G 0.83 - 34 19 6/12/2024 14 807 4a-G 0.8 - 33 19 6/17/2024 19 724 4a-G 0.59 - 0.3 20 X 6/18/2024 20 672 4a-G Flag not found during survey. 6/20/2024 22 610 4a-G 0.12 - 21 17 X 6/25/2024 27 532 4a-G Flag not found during survey. 6/26/2024 28 493 4a-G 0.06 - 10 19 5/30/2024 1 1,173 4a-H 19 0.03 14 19 16 New egg mass. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-4 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/6/2024 8 1,077 4a-H 0 14 16 19.5 6/7/2024 9 976 4a-H 0 - 11 18.5 Hatched. Black tadpoles. 6/8/2024 10 881 4a-H 0 - 7 20.5 100’s of tadpoles at risk of stranding 6/12/2024 14 807 4a-H -1.1 - - - X X 6/17/2024 19 724 4a-H -1.14 - - - 6/18/2024 20 672 4a-H -2.2 - - - 6/20/2024 22 610 4a-H -2.85 - - - 6/25/2024 27 532 4a-H -2.76 - - - 6/26/2024 28 493 4a-H -2.4 - - - 5/30/2024 1 1,173 4a-I 16 0.05 12 13 16 New egg mass. 6/6/2024 8 1,077 4a-I 0.2 8 10 19.5 6/7/2024 9 976 4a-I 0.2 4 7 19 6/8/2024 10 881 4a-I 0.1 1 3 21 X 6/12/2024 14 807 4a-I -1.04 - - - X X 6/17/2024 19 724 4a-I -1.1 - - - 6/18/2024 20 672 4a-I -2.1 - - - 6/20/2024 22 610 4a-I -2.38 - - - 6/25/2024 27 532 4a-I -2.74 - - - 6/26/2024 28 493 4a-I -2.3 - - - 6/6/2024 8 1,077 4a-J 19 0.5 5 10 19 X 18 when found; was found scoured 6/7/2024 9 976 4a-J 0.2 3 8 18 6/8/2024 10 881 4a-J Flag not found during survey. 6/12/2024 14 807 4a-J 0 - - - Hatching. 6/17/2024 19 724 4a-J -1.14 - - - X X New stranding; # dead unknown. 6/18/2024 20 672 4a-J -1.3 - - - X ~70 tads in edgewater. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-5 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/20/2024 22 610 4a-J Flag not found during survey. 6/25/2024 27 532 4a-J Flag not found during survey. 6/26/2024 28 493 4a-J Flag not found during survey. 6/6/2024 8 1,077 4a-K 14 2.8 32 37 19 New egg mass found on 6/5; Gosner 13 when found on 6/5. 6/7/2024 9 976 4a-K 2.3 26 38 18 6/8/2024 10 881 4a-K 1.7 24 29 19 6/12/2024 14 807 4a-K 1.5 - 25 19.5 Hatched. 6/17/2024 19 724 4a-K 0.3 - 0.22 - 6/18/2024 20 672 4a-K 0.27 - 0.17 19 X ~15 tads in edgewater. 6/20/2024 22 610 4a-K 0.12 - 15 17 X X 6/25/2024 27 532 4a-K 0.24 - 12 19 6/26/2024 28 493 4a-K 0.1 - 0.075 20.5 X 6/6/2024 8 1,077 4a-L 16 33 39 19 X developing; new egg mass first found scoured hanging on grass on 6/7/2024 9 976 4a-L 1.5 27 33 18 Not attached; stuck to grass. 6/8/2024 10 881 4a-L 1.1 21 24 18 Still hanging in there. 6/12/2024 14 807 4a-L 0.85 19 24 19 Eggs present, but about to hatch. 6/17/2024 19 724 4a-L 1.1 - 0.32 20 X 6/18/2024 20 672 4a-L 1.2 - 0.23 19 X ~15 tads by rock. 6/20/2024 22 610 4a-L 0.65 - 18 17.5 X ~50 tads in edgewater. 6/25/2024 27 532 4a-L 0.38 - 20 19 6/26/2024 28 493 4a-L 0.29 - 16 20 X 6/6/2024 8 1,077 4a-M 22 2.1 38 46 18 New egg mass found on 6/5; Gosner 21 when found on 6/5. 6/7/2024 9 976 4a-M 1.5 39 43 18 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-6 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/8/2024 10 881 4a-M 1.04 31 38 19 6/12/2024 14 807 4a-M 1.03 - 36 19 Hatched. 6/17/2024 19 724 4a-M 0.98 - 0.29 20 X 6/18/2024 20 672 4a-M 0.95 - 28 18 X 6/20/2024 22 610 4a-M 0.75 - 23 17 X 6/25/2024 27 532 4a-M 0.6 - 22 19 6/26/2024 28 493 4a-M 0.57 - 19 19 6/6/2024 8 1,077 4a-N 20 1.48 25 28 19 New egg mass found on 6/5; Gosner 19 when found on 6/5. 6/7/2024 9 976 4a-N 1.3 22 25 18 6/8/2024 10 881 4a-N 0.93 17 22 18 6/12/2024 14 807 4a-N 0.9 - 17 19 6/17/2024 19 724 4a-N 0.79 - 0.12 20 X ~20 tads in edgewater. 6/18/2024 20 672 4a-N 0.7 - 10 18 X 6/20/2024 22 610 4a-N 0.27 - 6 17 6/25/2024 27 532 4a-N -0.2 - 0.01 - 6/26/2024 28 493 4a-N -0.88 - - - 6/6/2024 8 1,077 4a-O 17 2.7 17 22 19 New egg mass found on 6/5; Gosner 16 when found on 6/5. 6/7/2024 9 976 4a-O 2.75 14 20 19 6/8/2024 10 881 4a-O 2.35 10 16 18.5 Hatched. 6/17/2024 19 724 4a-O 1.19 - 0.9 19 X 6/18/2024 20 672 4a-O 0.05 - 2 18 X 6/20/2024 22 610 4a-O -0.48 - 0.03 - X X Stranded and dead tads (~50). 6/25/2024 27 532 4a-O -0.42 - - - Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-7 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/26/2024 28 493 4a-O -0.5 - - - 6/6/2024 8 1,077 4a-P 17 2.5 16 25 19 New egg mass. 6/7/2024 9 976 4a-P 1.7 11 17 18.5 6/8/2024 10 881 4a-P 0.51 10 18 19 6/12/2024 14 807 4a-P 0.37 9 14 19.5 Jelly present but mostly hatched. 6/17/2024 19 724 4a-P 0.22 - 0.1 19 X ~30 tads in edgewater. 6/18/2024 20 672 4a-P 0.3 - 0.05 19 X ~20 tads in edgewater. 6/20/2024 22 610 4a-P 0.2 - 2 - X ~50 tads in edgewater. 6/25/2024 27 532 4a-P -0.03 - - - 6/26/2024 28 493 4a-P -0.32 - - - X 5/30/2024 1 1,173 4b-A 8 1.45 15 19 16 Gosner 6 when found on 5/29. 6/6/2024 8 1,077 4b-A 0.3 5 11 19.5 6/7/2024 9 976 4b-A 0 6 8 19 Top of mass slightly exposed to air. 6/8/2024 10 881 4b-A 0 - 0.25 19 probably getting stranded and the weight pulled it down into the 6/12/2024 14 807 4b-A 0 - - 19.5 No jelly remaining <1 cm water. 6/17/2024 19 724 -0.41 - - - X Two sizes present; ~35 tads. 6/18/2024 20 672 -0.35 - - - X ~15 tads in edgewater. 6/20/2024 22 610 -0.55 - - - X ~50 tads - 2 size classes in water. 6/25/2024 27 532 -1.42 - - - X ~50 tads in edgewater. 6/26/2024 28 493 -1.51 - - - X ~4 tads in edgewater. 6/6/2024 8 1,077 4b-B Tadpoles 0.03 to 0.5 - - 17.5 New (inferred) egg mass found on 6/5; ~100 tads more than yesterday. 6/7/2024 9 976 4b-B -0.56 - - 18.5 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-8 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/8/2024 10 881 4b-B -0.64 - - 18 X ~500 tads visible; likely >1 mass. 6/12/2024 14 807 4b-B -0.56 - - 19 6/17/2024 19 724 4b-B -0.68 - - - X 6/18/2024 20 672 4b-B -0.75 - - - X ~100 tads still in edgewater. 6/20/2024 22 610 4b-B -0.94 - - - X X X 6/25/2024 27 532 4b-B -0.8 - - - No tads in edgewater. 6/26/2024 28 493 4b-B -1.69 - - - X X X ~12 more tads stranded and dead. Just one alive in edgewater. 6/7/2024 9 976 4b-C Tadpoles 0 - 8 19 New egg mass inferred from tadpoles of a second size class. 6/8/2024 10 881 4b-C 0.35 - 15 19 6/12/2024 14 807 4b-C - - - 19 No tadpoles observed in edgewater. 6/12/2024 14 807 4b-D Tadpoles - 31 19 6/12/2024 14 807 4b-E - 31 19 6/12/2024 14 807 4b-F - 32 19 6/17/2024 19 724 0.55 - 0.22 19 X 6/18/2024 20 672 0.46 - 0.21 18 X ~6 tads in edgewater. 6/20/2024 22 610 0.3 - 0.15 18 X ~10 tads - 3 size classes in water. 6/25/2024 27 532 0.16 - 0.18 19.25 X ~10 tads in edgewater. 6/26/2024 28 493 0.19 - 12 18 No tads in edgewater. 6/12/2024 14 807 4b-G Tadpoles 0.79 - 42 19 6/17/2024 19 724 4b-G 0.67 - 0.45 19 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-9 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/18/2024 20 672 4b-G Flag not found during survey. 6/20/2024 22 610 4b-G 0.6 - 0.41 18 X ~10 tads - 2 size classes in water. 6/25/2024 27 532 4b-G 0.59 - 0.3 19.25 X ~6 tads in edgewater. 6/26/2024 28 493 4b-G 0.6 - 33 19 No tads in edgewater. 6/12/2024 14 807 4b-H Tadpoles 1.72 Dry 42 - tadpole group; at confluence of 6/12/2024 14 807 4b-I Tadpo les 1.72 - 42 19 tadpole group; at confluence of 6/17/2024 19 724 2.2 - 0.42 16.5 X At confluence ~10 tads visible. 6/18/2024 20 672 2.05 - 39 17 X 5-10 tads in edgewater. 6/20/2024 22 610 2.56 - 0.34 17 6/25/2024 27 532 1.7 - 0.75 - At confluence of FVC. 6/26/2024 28 493 1.64 - 22 16 At confluence of FVC. 6/25/2024 27 532 4b-J Tadpoles 0.25 - - - new, black tadpole group: not 6/26/2024 28 493 4b-J - - - Not flagged. 5/30/2024 1 1,173 4c - - - - No FYLF observed. 6/6/2024 8 1,077 4c-A Tadpoles 0.3 - 4 26 X X group on 6/5; Stranded and dead tads (unknown #). Some tads alive in deeper water; others salvaged, but side channel is ~25 m from base 6/7/2024 9 976 4c-A 0.2 - 2 26 Some tads still alive in 26C water, but will be stranded soon. 6/8/2024 10 881 4c-A 0.2 - 10 25 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-10 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/12/2024 14 807 4c-A -4.22 - - 25 6/17/2024 19 724 4c-A -32 - - - No FYLF tads in edgewater. 6/18/2024 20 672 4c-A -29.5 - - - Isolated pool now dried up. 6/20/2024 22 610 4c-A -29.8 - - - 6/25/2024 27 532 4c-A -30.1 - - - 6/26/2024 28 493 4c-A -30.35 - - - X X 6/12/2024 14 807 4c-B Tadpoles 3.2 - 20 24 6/17/2024 19 724 4c-B 3.3 - 21 20 X ~25 tads visible in side channel. 6/18/2024 20 672 4c-B -9.6 - - - X X 6/20/2024 22 610 4c-B -7.45 - - - 6/25/2024 27 532 4c-B -7.7 - - - 6/26/2024 28 493 4c-B -7.95 - - - X X 6/12/2024 14 807 4c-C Tadpoles 1.32 - 24 23.5 6/17/2024 19 724 4c-C 1.23 - 25 20 X ~40 tads visible in side channel. 6/18/2024 20 672 4c-C 1.09 - 17 28 X 6/20/2024 22 610 4c-C -0.2 - 9 26 6/25/2024 27 532 4c-C -0.45 - - - 6/26/2024 28 493 4c-C -0.7 - - - X X 6/12/2024 14 807 4c-D Tadpoles 1.5 - 32 24 tadpoles; in isolated pocket water 6/17/2024 19 724 4c-D 1.18 - 22 20 X ~50 tads visible; poo present. 6/18/2024 20 672 4c-D 0.78 - 20 26 X ~100 tads still slightly connected; mixed in with Hyla tads. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-11 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/20/2024 22 610 4c-D 0.3 - 14 24 X Will likely strand by Monday; ~50 tads mixed in with Hyla. 6/25/2024 27 532 4c-D -1.11 - - - X X ~50 tads now stranded and dead. 6/26/2024 28 493 4c-D -2.13 - - - X X 5/30/2024 1 1,173 4d-A 9 4.05 22 29 16.5 Gosner 7 when found on 5/29. 6/6/2024 8 1,077 4d-A 3.65 17 22 19 X 6/7/2024 9 976 4d-A 3 15 20 19.5 6/8/2024 10 881 4d-A 2.75 10 17 - May not strand. 6/12/2024 14 807 4d-A 1.83 - 12 20 No tads visible in edgewater; unfertilized remnant nearby. 6/17/2024 19 724 4d-A 1.6 - 0.04 18 6/18/2024 20 672 4d-A 1.23 - 0.06 - No tads observed in edgewater. 6/20/2024 22 610 4d-A -0.65 - - - X X 6/25/2024 27 532 4d-A -2.25 - - - No tads observed in edgewater. 6/26/2024 28 493 4d-A -1.15 - - - No tads observed in edgewater. 5/30/2024 1 1,173 4d-B 22 -0.12 - 12 19 stranded on 5/29 in side channel 6/6/2024 8 1,077 4d-B -0.15 - - 20 6/7/2024 9 976 4d-B -1.9 - 10 20/3 4 X X X in edgewater are likely to strand 6/8/2024 10 881 4d-B -2.1 - 8 - X ~25 tads remaining in edgewater. 6/12/2024 14 807 4d-B -3.1 - - - X ~10–15 tads in edgewater 6/17/2024 19 724 4d-B -3.24 - - - No tads observed in edgewater. 6/18/2024 20 672 4d-B -3.6 - - - No tads observed in edgewater. 6/20/2024 22 610 4d-B -4.18 - - - No tads observed in edgewater. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-12 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/25/2024 27 532 4d-B -3.35 - - - X X depression. None in edgwater, but 6/26/2024 28 493 4d-B -4.21 - - - No tads observed in edgewater. 6/6/2024 8 1,114 4d-C 15 0.9 9 19 18.5 New egg mass; male calling nearby. 6/7/2024 9 976 4d-C 0.94 7 16 19 Still intact; male still calling nearby. 6/8/2024 10 881 4d-C 0 6 10 19 Likely to strand at next flow level. Still intact; male still calling nearby. 6/12/2024 14 807 4d-C 0.29 5 9 22 Still attached and not stranded. 6/17/2024 19 724 4d-C 0.3 - 0.02 19.5 X 6/18/2024 20 672 4d-C 0.03 - 0.06 19 X ~150 tads in edgewater. 6/20/2024 22 610 4d-C -0.51 - - 18 X X X 6/25/2024 27 532 4d-C -0.95 - - - X ~20 tads in edgewater. 6/26/2024 28 493 4d-C -1.08 - - - X ~15 tads in edgewater. 6/25/2024 27 532 4d-D Tadpoles At edge 0 15 18 Inferred new egg mass; ~40 small tads clustered together. 6/26/2024 28 493 4d-D 0.65 - 14 19 X ~200 tads in edgewater. 5/31/2024 2 1,166 7a - - - - No egg masses or tadpoles observed. 6/6/2024 8 1,077 7a-A 21 -0.69 - - - X deeper water (Forest Service). 6/7/2024 9 976 7a-A -0.3 - - - 6/8/2024 10 881 7a-A -0.41 - - - 6/12/2024 14 807 7a-A -0.55 - - - 6/17/2024 19 724 7a-A -0.81 - - - X ~50 tads in edgewater. 6/18/2024 20 672 7a-A -1.09 - - - X ~50 tads in edgewater. 6/20/2024 22 610 7a-A -1.14 - - 20.5 X ~12 tads in edgewater. 6/25/2024 27 532 7a-A -1.35 - - 20 X 2 tads in edgewater (~15 cm depth). 6/26/2024 28 493 7a-A -1.5 - - - No tads in edgewater. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-13 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/6/2024 8 1,077 7a-B 7 1.32 37 44 18 Gosner 3 when found on 6/5. 6/7/2024 9 976 7a-B 1.11 33 37 - 6/8/2024 10 881 7a-B 0.83 26 30 19 6/12/2024 14 807 7a-B 1.01 21 26 20.5 6/17/2024 19 724 7a-B 0.8 - 26 19 X Tads from all EMs ~300. 6/18/2024 20 672 7a-B 0.32 - 13 17 X Tads from all EMs ~300. 6/20/2024 22 610 7a-B 0.12 - 9 19 X 6/25/2024 27 532 7a-B 0.12 - 3 19 X 6/26/2024 28 493 7a-B 0 - - - X X X 6/6/2024 8 1,077 7a-C 16 1.28 43 45 18 Gosner 15 when found on 6/5. 6/7/2024 9 976 7a-C 1.08 35 38 - 6/8/2024 10 881 7a-C 0.8 28 29 19 6/12/2024 14 807 7a-C 0.83 - 22 20.5 X 6/17/2024 19 724 7a-C 0.68 - 21 19 X Tads from all EMs ~300. 6/18/2024 20 672 7a-C 0.41 - 15 17 X Tads from all EMs ~300. 6/20/2024 22 610 7a-C 0.16 - 9 19 X 6/25/2024 27 532 7a-C 0.06 - 4 19 X 6/26/2024 28 493 7a-C 0 - 1 - X ~25 tads at EMs B&C. 6/6/2024 8 1,077 7a-D 21 1.62 29 36 18.5 Gosner 20 when found on 6/5. 6/7/2024 9 976 7a-D 1.17 22 25 - 6/8/2024 10 881 7a-D 1.1 16 22 19 6/12/2024 14 807 7a-D 1.46 - 27 20.5 X Hatched and hundreds of tadpoles. 6/17/2024 19 724 7a-D 0.71 - 21 19 Spread out within 1.5 x 5.2 m. 6/18/2024 20 672 7a-D 0.38 - 13 17 X Tads from all EMs ~300. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-14 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/20/2024 22 610 7a-D 0.38 - 7 19 X 6/25/2024 27 532 7a-D 0 - 1 19 X 6/26/2024 28 493 7a-D 0 - - - New stranding. 6/7/2024 9 976 7a-E 13 - - - - Gosner not matching up to other 6/8/2024 10 881 7a-E 0.84 24 25 19 Floated upstream from yesterday. Originally flagged by 7a-D 6/12/2024 14 807 7a-E 1.06 - 20 20.5 6/17/2024 19 724 7a-E 0.52 - 13 19 X Tads from all ems ~300 6/18/2024 20 672 7a-E 0.31 - 9 17 X Tads from all ems ~300 6/20/2024 22 610 7a-E 0.15 - 3 19 X X 6/25/2024 27 532 7a-E -0.25 - - - X 6/26/2024 28 493 7a-E -0.35 - - - 6/20/2024 22 610 7a-F 22 0.63 - 38 19 New egg mass inferred; found 6/19. 6/25/2024 27 532 7a-F 0.55 - 30 19 X ~75 tads remaining near EM-F. 6/26/2024 28 493 7a-F 0.5 - 23 22.5 X ~10 tads in area of EM-F. 5/31/2024 2 1,166 7b-A 15 3.42 40 49 16 6/6/2024 8 1,077 7b-A - - - - X 6/7/2024 9 976 7b-A 2.7 - 41 18.5 6/8/2024 10 881 7b-A 2.2 - 32 19 6/12/2024 14 807 7b-A 2.17 - 33 20.5 6/17/2024 19 724 7b-A 1.38 - 0.26 - 6/18/2024 20 672 7b-A 1.05 - 0.2 - No tads in edgewater. 6/20/2024 22 610 7b-A 0.48 - 17 - 6/25/2024 27 532 7b-A 0.26 - 12 - X 4 tads in side pool between H&A. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-15 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/26/2024 28 493 7b-A 0.25 - 11 23 5/31/2024 2 1,166 7b-B 17 3.99 30 40 16 New egg mass; frayed. 6/6/2024 8 1,077 7b-B - - - - X 6/7/2024 9 976 7b-B 3.6 - 30 18.5 Scoured on 6/6. 6/8/2024 10 881 7b-B 2.8 - 22 19 6/12/2024 14 807 7b-B 3.07 - 24 20.5 6/17/2024 19 724 7b-B 2.58 - 0.2 - X 6/18/2024 20 672 7b-B 1.35 - 0.2 - No tads in edgewater. 6/20/2024 22 610 7b-B 0.85 - 11 - 6/25/2024 27 532 7b-B 0.15 - 6 22 No tads in edgewater. 6/26/2024 28 493 7b-B 0.05 - 1 24 Oviposition site almost stranded. 6/7/2024 9 976 7b-C X -0.73 - - - X X New egg mass; partially scoured and partially stranded and desiccated. 6/8/2024 10 881 7b-C -0.61 - - - Fully stranded today. 6/12/2024 14 807 7b-C -0.78 - - - 6/17/2024 19 724 7b-C -1.65 - - - 6/18/2024 20 672 7b-C -3.3 - - - 6/20/2024 22 610 7b-C -3.2 - - - 6/25/2024 27 532 7b-C -3.73 - - - 6/26/2024 28 493 7b-C -3.9 - - - 6/7/2024 9 976 7b-D 13 -0.065 2 2 - X and detached; some desiccated egg 6/8/2024 10 881 7b-D -0.1 - - - Remnant not visible. 6/12/2024 14 807 7b-D -0.16 - - - No tads in edgewater. 6/17/2024 19 724 7b-D -1.05 - - - X One tad in edgewater. 6/18/2024 20 672 7b-D -1.3 - - - 6/20/2024 22 610 7b-D -1.7 - - - Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-16 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/25/2024 27 532 7b-D -1.9 - - - 6/26/2024 28 493 7b-D -2.45 - - - 6/8/2024 10 881 7b-E - 0.34 4 4 20.5 X Eggs dead inside jelly. Stranded in 6/12/2024 14 807 7b-E 0.34 - 0 - Unviable. 6/17/2024 19 724 7b-E -0.12 - - - Unviable. 6/18/2024 20 672 7b-E -1.5 - - - Now fully stranded. Pool nearly dry. 6/20/2024 22 610 7b-E -8.3 - - - 6/25/2024 27 532 7b-E -8.6 - - - 6/26/2024 28 493 7b-E -8.71 - - - 6/18/2024 20 672 7b-F 13 2.8 21 31 11 6/20/2024 22 610 7b-F 1.95 13 21 - Still intact and developing. 6/25/2024 27 532 7b-F 1.7 10 18 18.5 Intact and developing. 6/26/2024 28 493 7b-F 1.75 9 15 20 About to hatch; one tad out of jelly. 6/18/2024 20 672 7b-G 10 3.1 32 36 10.5 6/20/2024 22 610 7b-G 2.7 25 28 - Still intact and developing. 6/25/2024 27 532 7b-G 2.53 22 27 18 Intact and developing. 6/26/2024 28 493 7b-G 2.45 18 20 19.5 Still intact and developing. 6/20/2024 22 610 7b-H 13 0.55 - 10 - X scoured and hung up on willow on 6/19); on 6/20, scoured downstream 6/25/2024 27 532 7b-H -0.24 - - - No tads observed in edgewater. 6/26/2024 28 493 7b-H -0.25 - - - X ~5 Tads in edgewater and poop. 6/20/2024 22 610 7b-I Tadpoles -0.12 - - - X X X new tadpole group; 40–50 dead and many more stranded/~40 tads in Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-17 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Date Day of Spill Recession Flow Level 1 Egg Mass ID Gosner Stage2 from shore mass depth Max depth (cm) Temp (°C) EM Stranded EM Stranded Tadpoles Notes3 Dead Alive in Edgewater 6/25/2024 27 532 7b-I 0.05 - 3 23 X 6/26/2024 28 493 7b-I -0.42 - - - X X Tadpoles stranded ~10 u/s of flag. 1CDEC flows may not correspond with flows reported by Rock Creek Switching Center on actual survey date. Reference Appendix B 2Gosner stage approximated based on stage at first observation (see notes) 3Tadpole numbers are unquantifiable estimates Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-18 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Example 1. Subsite 4a: Egg masses “4a-A” (red star) and “4a-B” (blue star) location at various flow levels during Protocol 2 Spill Recession between May 30 and June 7, 2024. Stars indicate oviposition attachment site (see insets) for each respective egg mass. Example 2. Subsite 4a: Egg mass “4a-D” (red star) at various flow levels during Protocol 2 Spill Recession between May 30 and June 17, 2024. Red star indicates oviposition attachment site (see inset). Example 3. Subsite 4a: Egg mass “4a-E” (red star) at various flow levels during Protocol 2 Spill Recession between May 30 and June 17, 2024. Red star indicates oviposition attachment site (see inset). Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-19 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Example 4. Subsite 4b at Flea Valley Creek confluence: tadpole groups “4a-E” and “4b-I” (red star) at various flow levels during Protocol 2 Spill Recession between June 12 and June 25, 2024. Red star indicates approximate location of tadpole groups. Example 5. Subsite 4c: tadpole group “4c-A” (red star) at various flow levels during Protocol 2 Spill Recession between June 6 and June 18, 2024. Red star indicates initial approximate location of tadpole groups. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-20 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Example 6. Subsite 4d: Egg mass “4d-A” (red star) at various flow levels during Protocol 2 Spill Recession between May 30 and June 20, 2024. Red star indicates oviposition attachment site (see inset). Example 7. Subsite 4d: Egg mass “4d-B” (red star) at various flow levels during Protocol 2 Spill Recession between May 30 and June 26, 2024. Red star indicates oviposition attachment site (see inset). Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-21 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Example 8. Subsite 7a: Egg mass “7a-A” (red star) at various flow levels during Protocol 2 Spill Recession between June 6 and June 12, 2024. Red star indicates oviposition attachment site (see inset). Example 9. Subsite 7a: Egg mass “7a-B” (red star) at various flow levels during Protocol 2 Spill Recession between June 6 and June 25, 2024. Red star indicates oviposition attachment site (see inset). Example 10. Subsite 7b: Egg mass “7b-C” (red star) at various flow levels during Protocol 2 Spill Recession between June 6 and June 12, 2024. Red star indicates oviposition attachment site (see inset). Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-22 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Example 11. Subsite 7b: Egg mass “7b-D” (red star) at various flow levels during Protocol 2 Spill Recession between June 6 and June 8, 2024. Red star indicates oviposition attachment site. Egg mass scoured and stranded (see inset). Example 12. Subsite 7b: Egg mass “7b-E” (red star) at various flow levels during Protocol 2 Spill Recession between June 8 and June 20, 2024. Red star indicates oviposition attachment site (see inset). Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-23 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Example 13. Subsite 1b: staff gauges (center) indicating edgewater at various flow levels (1,220 to 449 cfs) during Protocol 2 Spill Recession between May 30 and June 26, 2024. Total distance between beginning (May 30) and ending (June 26) edgewater measurements from 1,220 to 449 cfs was 1.2 m. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix D D-24 May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Example 14. Subsite 7b: staff gauges (red arrows) indicating edgewater at various flow levels (1,220 to 449 cfs) during Protocol 2 Spill Recession between May 30 and June 26, 2024. Total distance between beginning and ending edgewater measurements from 1,220 to 449 cfs was 20.4 m. Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Poe Project (FERC Project No. 2107) 2024 Foothill-yellow Legged Frog Survey Report Appendix E May 2025 Poe Project (FERC Project No. 2107) ©2025, Pacific Gas and Electric Company Appendix E: Analysis of Mean Daily Flow and Egg Mass Observations during Breeding Surveys from 2019 to 2024 for Foothill Yellow-legged Frog on the Poe Reach of the North Fork Feather River Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Internal Note: Vertical lines represent VES dates. Egg masses shown in figure represent the estimated date of oviposition, not the date observed. Scoured and Stranded egg masses represent date found scoured or stranded. 2024 – Normal YearDocument Accession #: 20250529-5106 Filed Date: 05/29/2025 Internal 2023 – Wet Year Note: Vertical lines represent VES dates. Egg masses shown in figure represent the estimated date of oviposition, not the date observed. Scoured and Stranded egg masses represent date found scoured or stranded. 0 .0 5 .0 1 0.0 1 5.0 2 0.0 2 5.0 0 2 000 4 000 6 000 8 000 1 0000 1 2000 4 /1 2 4/19 4 /2 6 5/3 5 /1 0 5/17 5 /2 4 5/31 6 /7 6/14 6 /2 1 6/28 7/5 7/12 7 /1 9 Number of Egg Masses Daily Mean Water Temperature (℃) Mean Daily Flow (cfs) Mean D aily Fl ow (cfs) 202 3 D aily M ea n T emp Poe Subsite 1b D aily M ea n T emp Poe Site 7 Eg g Mass Oviposition Da te D ate Egg Mass Found S coured D ate Egg Mass Found S tranded Rampdown Period Wet Year Egg Masses N=41 Total Sc oured = 7 * Earliest Date of O v iposition 1 -J un 2 ,7 9 0 First Eg g M asses O bserv ed 1 2 -J un 1 ,6 4 0 F irst S couring O bserv ed 2 8 -J un 1 ,0 7 4 Total O bserv ed S coured 7 1 ,0 7 4 -8 9 2 F irst S tranding O bserv ed 1 2 -J un 1 ,6 4 0 Total O bserv ed S tranded* 8 1 ,6 4 0 - 5 6 6 M ean Daily F low (M DF ; cfs) Total Stranded = 8 * MDF was hi gh duri ng the breedi ng season wi t h occasi onal ext reme fl uctuati ons due t o snowmel t runoff. Fl ows ranged between 7 ,35 6 c fs on April 1 5 t o 5 8 4 on J ul y 3 1 , wi t h the hi ghest flow on Apri l 30 at 1 0 ,7 5 8 cfs. Of the 4 1 egg masses observed, 2 4 were i nferred from t adpol e groups observed duri ng t he ramp-down, vari anc e fl ow reduc ti on, and reac h- wi de surveys. *Exc ept for one egg mass found stranded on 6 - 1 2, nu mbers record ed i n thi s tabl e are onl y th ose found sc oured or st randed duri ng t he ramp-down peri od. Except for one, al l sc oured egg masses were sc oured wh en fi rst found. In addi t i on to egg mass st randi ngs duri ng t he ram p- down, 1 8 of 2 4 tad pol e groups were found st ran ded duri n g t he subsequent vari ance. Ei ght of those tadpol e groups represented i nferred egg masses. Total Egg Masses = 4 1Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Internal 2022 – Dry Year *Vertical lines represent VES dates. Egg masses shown in figure represent the estimated date of oviposition, not the date observed. Ea rliest Date of O v iposition 2 3 -Ap r 4 5 9 F irst Eg g M asses O bserv ed 2 6 -Ap r 4 4 9 F irst scouring O bserv ed 5 -May 4 3 7 Total O bserv ed S coured 2 4 3 7 t o 4 4 5 Tot al Sc o ured = 2 MDF h ad mi ni mal fl uc tu at i o ns d uri ng t he b reed i n g season . The l argest i n c rease was 6 2 c fs on 4 -2 1 . Tw o egg m asses were fo un d sc oured at sub si t es 4 c an d 7 b. D ue to a dry wat er year, a ram p do wn p l an was not needed. M ean Da ily F low (M DF ; cfs) Tot al Egg Masses* = 7 0 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Internal 2021 – Critically Dry Year *Vertical lines represent VES dates. Egg masses shown in figure represent the estimated date of oviposition, not the date observed. 0 5 10 15 20 25 100 300 500 700 900 1100 1300 1500 Nu m b e r o f E g g M a s s e s Da i l y M e a n W a t e r T e m p e r a t u r e ( ℃) Me a n D a i l y F l o w ( c f s ) Mean Daily Flow 2021 Egg Mass Daily Mean Temp Poe Subsite 1b Daily Mean Temp Poe Site 7 2021 - Critically Dry Year Egg Masses N=114 Earliest Date of O v iposition 1 2 -Apr 3 4 2 F irst Eg g M asses O bserv ed 1 6 -Apr 3 4 2 M ea n Daily F low (M DF ; cfs) MD F h ad m i n i m al fl u c t uat i on s d uri ng t h e breedi n g seaso n. Fl ows ran ged b et ween 3 2 0 c fs and 3 6 2 c fs, a d i fferen c e o f j ust 4 2 c fs.Th e l argest i nc rease was 1 0 c fs bet w een 4 -2 4 and 4 - 2 5 when t he p eak fl ow of 3 6 2 c fs w as reac hed. No egg masses w ere fou nd sc o u red. D ue t o a d ri t i c al l y d ry wat er year, a ram pd own pl an was n ot n eed ed . To t al Egg Masses = 1 1 4 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Internal 2020 – Critically Dry Year *Vertical lines represent VES dates. Egg masses shown in figure represent the estimated date of oviposition, not the date observed. Scoured egg masses represent date found scoured. 0 5 10 15 20 25 300 310 320 330 340 350 360 370 380 4/12 4/19 4/26 5/3 5/10 5/17 5/24 5/31 6/7 6/14 6/21 6/28 7/5 7/12 Nu m b e r o f E g g M a s s e s Da i l y M e a n W a t e r T e m p e r a t u r e ( ℃) Me a n D a i l y F l o w ( c f s ) Mean Daily Flow (cfs) Egg Mass Scoured Egg Mass Daily Mean Temp Poe Subsite 1b Daily Mean Temp Poe Site 7 2020 - Critically Dry Year Egg Masses N=136 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Internal 2019 – Wet Year *Egg masses shown in figure represent the estimated date of oviposition, not the date stranded. 0 4 8 12 16 20 0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 Nu m b e r o f E g g M a s s e s Av e r a g e D a i l y F l o w ( c f s ) Poe Reach Flows W/ New License Rampdown Poe Subsite Egg Masses Mill Creek Egg Masses All Stranded Egg Masses Mean Dai l y Fl o w (MD F; c fs) Earliest Date of O v iposition 2 -J u n 1 ,9 0 6 F irst Egg M asses O bserv ed 1 0 -J un 1 ,2 4 2 F irst S tranding Observ ed 1 9 -J un 6 1 4 Total O bserv ed S tranded 5 6 5 1 t o 6 1 4 Date Rang e of Total Losses 6 /5 t o 6 /1 9 2 ,0 7 9 t o 6 1 4 Total Egg Masses* = 4 5 MD F receded ~1 ,5 0 0 cfs b et ween 6 /5 and 6 /1 9 . Al l st rand ed egg masses at P oe sub si tes were observed duri n g surveys on 6 /1 9 aft er fl ows d ropped ~6 3 0 c fs bet ween 6 /1 0 and 6 /1 9 . Thi rt een addi t i onal egg masses were observed up stream of Mi l l Creek, si x of whi ch were foun d stranded on 6 /1 8 . Total Stran ded = 5 Document Accession #: 20250529-5106 Filed Date: 05/29/2025 Document Content(s) PGE20250529_2107_Amphibian_2024_Monitoring_Report.pdf ....................1 Document Accession #: 20250529-5106 Filed Date: 05/29/2025