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Home My WebLink About3.16.22 Water Conditions in California Reportjj .. _ �' � �3ti '�' �• � 1-r�\ •k', 54 L•��Y�M' hEr -1 i•�X vif•?L"r� �. oJ¢-�R�rr*, �' • r.yyy L•! . ' ` f_ � �� Y y . r.. �a .4' ' sty 5n�y �'• ,. Ji ' •�. }. rk - w �•'�,� 'k �•' f •f��, x �`. � J' _ ;r 17/t:2^2Y TYA,r,��''r�� „S r - -4*: r' •8 ` 1a •er .Li '� a � r7 i art c•� . ¢" ••1 STATE OF CALIFORNIA Gavin Newsom, Governor CALIFORNIA NATURAL RESOURCES AGENCY Wade Crowfoot, Secretary for Natural Resources Department of Water Resources Karla Nemeth Director Cindy Messer Gary Lippner Kristopher Tjernell Ted Craddock Lead Deputy Director Deputy Director Deputy Director Deputy Director Kathie Kishaba John Paasch John Andrew Paul Gosselin Deputy Director Deputy Director Deputy Director Deputy Director Joel Ledesma Kasey Schimke Bianca Sievers Margaret Mohr Thomas Gibson Deputy Director Deputy Director Deputy Director Deputy Director General Counsel Division of Flood Management Jeremy Arrich.........................................................................................Manager, Division of Flood Management Jeremy Hill..............................................................................Manager, Hydrology and Flood Operations Branch David Rizzardo..........................................................................................................Manager, Hydrology Section Prepared by Sean de Guzman .......................................... RameshGautam........................................... Andrew Reising............................................. Lauren Alkire................................................. Anthony Burdock ........................................... StephenNemeth ........................................... Public Agencies Buena Vista Water Storage District East Bay Municipal Utility District El Dorado Irrigation District Friant Water Users Association Kaweah Delta Water Conservation District Kern Della Water District Kings River Conservation District Lower Tule River Irrigation District Merced Irrigation District Modesto Irrigation District Nevada Irrigation District North Kern Water Storage District Northern California Power Agency Oakdale Irrigation District Omochumne-Hartnell Water District Placer County Water Agency Sacramento Municipal Utility District San Joaquin River Exchange Contractors Water Authority South Feather Water and Power Agency South San Joaquin Irrigation District Tri-Oam Project Truckee River Basin Water Commission Tulare Lake Basin Water Storage District Turlock Irrigation District Yuba Water Agency .......Manager, Snow Surveys and Water Supply Forecasting Unit ...........................Manager, California Cooperative Snow Surveys ...........................................................Engineer, Water Resources ...........................................................Engineer, Water Resources ...........................................................Engineer, Water Resources ............................Engineer, Water Resources (Retired Annuitant) COOPERATING AGENCIES Private Organisations J.G. Boswell Company Kaweah and St. Johns River Association Kings River Water Association Tvle River Association Slate Water Project Contractors Municipalities City of Bakersfield Water Department City of Los Angeles Department of Water and Power City and County of San Francisco Hatch Hetchy Water and Power State Agencies University of California Central Sierra Snow Laboratory Scripps Institution of Oceanography Center for Western Weather and Water Extremes California Department of Forestry & Fire Protection California Department of Water Resources Public Utilities Pacific Gas and Electric Company Southern California Edison Company Federal Agencies U.S. Department of Agriculture Forest Service (14 National Forests) Natural Resource Conservation Service U.S. Department of Commerce National Weather Service U.S. Department of Interior Bureau of Reclamation Geological Survey. Water Resources National Park Service (3 National Parks) U.S. Department of Army Corps of Engineers National Aeronautics and Space Administration Jet Propulsion Laboratory Other Cooperative Programs Nevada Cooperative Snow Surveys Oregon Cooperative Snow Surveys Summary of Water Conditions February 1, 2022 Water Year 2022 started well with a wet October bringing rainfall during a category-5 atmospheric river. However, it was followed by a dry November. December snowfall boosted California's snowpack well above average during a series of cooler storms bringing widespread snow across the state. UC Berkeley's Central Sierra Snow Laboratory reported its snowiest December on record. Unfortunately, January was one of the driest January's on record with no recorded precipitation on the San Joaquin 5-Station and Tulare Lake 6-Station precipitation indices. California's climate is experiencing volatile shifts from wet to dry year after year and month after month, which make water management and water supply forecasting extremely challenging in a changing climate. Forecasts of median April through July runoff are 85 percent of average compared to only 70 percent last year at this time and an eventual 30 percent at the end of July. Water year runoff is projected to be 90 percent of average, compared to only 55 percent last year at this time and an eventual 35 percent at the end of the water year. Snowpack water content is about 105 percent for this date. This compares with 70 percent one year ago. The pack is about 70 percent of the April 1 average, normally the time of maximum accumulation. Most of the snowpack accumulated during the series of storm events in late December that pushed statewide snowpack up to 155 percent of average for January 1. Precipitation from October through January is 100 percent of average statewide compared to a poor 55 percent last year at this time. Record rainfall occurred in late October during a category-5 atmospheric river that helped soak parched and scorched soils from the two previous water years. More precipitation has fallen this year through the end of January compared to all of Water Year 2021. Runoff from October through January is 90 percent, boosted by the two big storm events at the end of October and end of December; last year produced only 30 percent in this 4-month period. Estimated runoff of the eight major rivers of the Sacramento -San Joaquin River region in January was 1.63 million acre- feet. Reservoir storage is about 17.2 million acre-feet or 75 percent of average, less than the 18.4 million acre-feet observed one year ago. Statewide storage has increased more than 5 million acre-feet since its low during the third week of October mostly due to the storms during the end of October and December. SUMMARY OF WATER CONDITIONS IN PERCENT OF AVERAGE PRECIPITATION FEBRUARY 1 FEBRUARY 1 RUNOFF APRJULY WATER YEAR HYDROLOGIC REGION OCTOBER 1 TO SNOW WATER RESERVOIR OCTOBER 1 RUNOFF RUNOFF DATE CONTENT STORAGE TO DATE FORECAST FORECAST NORTH COAST 85 70 55 80 65 70 SAN FRANCISCO BAY 130 100 150 CENTRAL COAST 105 55 110 SOUTH COAST 105 85 75 SACRAMENTO RIVER 115 120 80 95 85 90 SAN JOAQUIN RIVER 105 100 80 120 90 90 TULARE LAKE 100 100 70 _ 70 80 80 NORTH LAHONTAN 140 130 60 125 90 95 SOUTH LAHONTAN 85 110 90 80 85 85 COLORADO RIVER -DESERT 35 70 'STATEWIDE --- 100_- 105 -_-- 75 90 85 -_-- 90---- DEPARTMENT OF WATER RESOURCES CALIFORNIA COOPERATIVE SNOW SURVEYS SEASONAL PRECIPITATION in percent of average to date October 1, 2021 through January 31, 2022 NL SR 140% SF 130% Y✓` 105% iTL 100% Hydrologic Regions 105% NC - North Coast SF -San Francisco Bay CC - Central Coast SC - South Coast SR - Sacramento River SJ - San Joaquin River TL - Tulare Lake NL - North Lahontan o SL - South Lahontan CR - Colorado River - Desert Statewide 100% SL 85% x SC R CsY,� 35% 105%� i WATER YEAR IS OCTOBER 1 THROUGH SEPTEMBER 30 2 DEPARTMENT OF WATER RESOURCES CALIFORNIA COOPERATIVE SNOW SURVEYS Forecast of April through July Unimpaired Runoff in percent of historical average as of February 1, 2022 Scott 54% Trinity 66% Sacramento 76% Feather 86% Yuba 97% American 94% Cosumnes 68% Mokelumne 96, Stanislaus 92516 Tuolumne 87% Merced 86%/ San Joaquin 95% Kings 87% Kaweah 83% Tule 57% Kern 70% Legend 52% Runoff forecast in percent of normal N Statewide 86% Truckee 99% — Tahoe 86% Carson 87% Walker 89% Mono*72% ti Owens* 85% �*Forecast by Department of Water and Power, City of Los Angeles 3 FEBRUARY 1, 2022 FORECASTS APRILJULY UNIMPAIRED RUNOFF Unimpaired Runoff in 1,000 Acre -Feet (1) HYDROLOGIC REGION HISTORICAL FORECAST 30 Yr Max of Min of Apr -Jul 1 Pc 80 % and Watershed Avg Record Record Forecast of Probability (2) (13) (13) Avg Range (1) North Coast Trinity River at Lewiston Lake SACRAMENTO RIVER Upper Sacramento River Sacramento River at Delta above Shasta Lake McCloud River above Shasta Lake Pit River near Montgomery Creek + Squaw Creek Total Inflow to Shasta Lake Sacramento River above Bend Bridge, near Red Bluff Feather River Feather River at Lake Almanor near Prattville (3) North Fork at Pulga (4) Feather River at Oroville Yuba River North Yuba below Goodyears Bar (5) Canyon Creek below Bowman Lake (5) South Yuba at Langs Crossing (6) Yuba River near Smartsville plus Deer Creek American River North Fork at North Fork Dam (7) Silver Creek below Camino Diversion Dam (8) American River below Folsom Lake 648 1,593 80 430 66% 200 - 850 309 751 39 220 71% 393 850 185 280 71% 992 2,098 480 780 79% 1,767 3,525 711 1,340 76% 880 - 2,480 2,474 5,117 943 1,870 76% 1,200 - 3,680 241 640 77 220 91% 842 2,291 187 740 88% 1,710 4,676 378 1,470 86% 880 - 3,010 271 612 40 260 96% 103 177 36 105 102% 237 559 48 230 97% 993 2,424 151 960 97% 490 - 1,760 240 562 40 230 96% 157 390 31 155 99% 1,247 3,074 189 1,170 94% 630 - 2,210 S AN JOAQUIN RIVER Cosumnes River at Michigan Bar 133 446 8 90 68% 30 - 280 Mokelumne River South Fork near West Point (5) 40 143 3 40 100% Total Inflow to Pardee Reservoir 469 1,076 75 450 96% 240 - 760 Stanislaus River Middle Fork below Beardsley Dam (8) 297 680 84 290 98% North Fork Inflow to McKays Point Dam (9) 197 462 30 175 89% Stanislaus River below Goodwin Reservoir (12) 699 1,710 116 640 92% 340 - 1,140 Tuolumne River Cherry Creek below Dion Power Plant (5) 317 672 64 275 87% Tuolumne River near Hatch Hetchy (4) 587 1,203 180 510 87% Tuolumne River below La Grange Reservoir (12) 1,222 2,682 301 1,060 87% 640 - 1,830 Merced River Merced River at Pohono Bridge (5) 369 820 75 320 87% Merced River below Merced Falls (12) 627 1,587 105 540 86% 300 - 940 San Joaquin River Big Creek below Huntington Lake (10) 97 211 4 95 98% South Fork near Florence Lake (11) 188 377 55 185 98% San Joaquin River inflow to Millerton Lake 1,229 3,355 193 1,170 95% 670 - 1,890 Kings River Kings River below Dinkey Creek (14) 395 932 44 350 89% Kings River below Pine Flat Reservoir 1,204 3,113 208 1,050 87% 610 - 1,790 Kaweah River below Terminus Reservoir 276 814 42 230 83% 120 - 430 Tule River below Lake Success 56 259 1 32 57% 14 - 95 Kern River Kern River near Kernville (11) 379 1,088 57 270 71% Kern River inflow to Lake Isabella 427 1,657 57 300 70% 180 - 590 (1) See inside back cover for definition (2) All 30 year averages are based on years 1991-2020 unless otherwise noted (3) Apr -Jul average, min,max based on years 1981-2015 (4) Apr -Jul average, min,max based on years 1968-2015 (5) Apr -Jul average, min,max based on years 1966-2015 (6) Apr -Jul average, min,max based on years 1981-2015 (7) Apr -Jul average, min,max based on years 1972-2015 (8) Apr -Jul average, min,max based on years 1987-2015 (9) Apr -Jul average, min,max based on years 1989-2015 (10) Apr -Jul average, min,max based on years 1988-2015 (11) Apr -Jul average, min,max based on years 1976-2015 12 FEBRUARY 1, 2022 FORECASTS WATER YEAR UNIMPAIRED RUNOFF Unimpaired Runoff in 1,000 Acre -Feet (1) HISTORICAL DISTRIBUTION FORECAST 30 Yr Max of Min of Oct Water Pct 80 Avg Record 1 Record Thru Feb Mar Apr I May Jun Jul Aug Sep I Year I of Probability (2) (15) (15) Jan • Forecast Avg Range (1) 1322 2990 200 215 98 182 160 180 70 20 6 4 935 71% 545 - 1,640 865 1,965 165 1,178 2,353 557 2,841 5,150 1,484 5,643 10,796 2,444 1,372 518 840 495 390 250 205 190 190 4,450 79% 3,390 - 7,070 8,351 17,180 3,294 2,087 785 1,260 700 530 365 275 243 240 6,485 78% 4,905 - 10,745 610 1,194 329 2,122 4,741 570 4,341 10,171 994 1,305 430 821 585 510 250 125 94 80 4,200 97% 3,035 - 7,235 544 1,133 102 242 368 75 379 733 176 2,273 5,984 369 654 206 387 360 390 175 35 20 18 2,245 99% 1,465 - 3,575 580 1,356 66 301 681 105 2,689 7,391 349 783 251 465 430 490 205 45 15 11 2,695 100% 1,810 - 4,395 390 1,253 20 129 40 77 53 33 3 1 1 1 338 87% 195 - 780 107 349 8 764 1,901 129 159 51 101 125 200 110 15 5 4 770 101% 480 - 1,195 416 937 144 301 645 100 1,181 3,078 155 217 74 148 200 260 150 30 11 5 1,095 93% 680 - 1,785 497 1,041 70 749 1,645 206 1,954 4,862 383 332 100 208 260 430 310 60 14 6 1,720 88% 1,165 - 2,730 469 1,062 92 1,007 2,787 150 139 54 113 140 230 140 30 9 5 860 85% 535 - 1,395 164 356 11 236 507 71 1,775 4,642 327 296 78 148 240 450 360 120 40 18 1,750 99% 1,125 - 2,645 545 1,309 104 1,671 4,287 359 147 58 119 210 410 330 100 32 15 1,421 85% 885 - 2,320 426 1,402 74 33 21 45 60 90 65 15 4 2 335 79% 190 - 600 132 615 10 16 9 17 15 12 4 1 0 0 74 56% 40 - 190 574 1,639 120 672 2,318 130 54 26 56 75 105 85 35 14 10 460 68% 295 - 855 (12) Forecast point names based on USGS gage names. Stanislaus below Goodwin also known as inflow to New Melones, Tuolumne River below La Grange also known as inflow to Don Pedro, Merced River below Merced Falls also known as inflow to McClure. (13) For the tributaries, the min and max values were determined using the same period of record as the Apr -Jul values. (14) Apr -Jul average, min, max based on years 1970-2015. (15) For the tributaries, the average, min and max values may not be calculated over the same period as the Apr -Jul values. ` Unimpaired runoff in months prior to forecast date are based on measured flows 5 FEBRUARY 1, 2022 FORECASTS APRILJULY UNIMPAIRED RUNOFF Apr -Jul Unimpaired Runoff in 1,000 Acre -Feet (1) HYDROLOGIC REGION HISTORICAL FORECAST and Watershed 30 Yr Max Min Apr -Jul Pct Avg of of Forecasts of (2) Record Record Avg NORTH COAST Scott River Scott River nr Ft Jones (3) Klamath River Total inflow to Upper Klamath Lake (4) NORTH LAHONTAN 173 398 22 93 54% 475 1,150 149 253 53% Truckee River Lake Tahoe to Farad accretions 252 Lake Tahoe Rise (assuming gates closed, ft) 1.4 Carson River West Fork Carson River at Woodfords 53 East Fork Carson River near Gardnerville 188 Walker River West Walker River below Little Walker, near Coleville 164 East Walker River near Bridgeport 59 713 48 250 99% 3.9 0.1 1.2 86% 135 10 45 85% 485 43 165 88% 406 35 145 88% 209 7 53 90% SOUTH LAHONTAN Owens River Total tributary flow to Owens River (5) 231 579 84 197 85% (1) See inside back cover for definition (2) All 30 year averages are based on years 1991-2020 unless otherwise noted (3) Forecast by National Weather Service Califomia-Nevada River Forecast Center. 30 yr average (1981-2010) (4) Forecast by U.S. Natural Resource Conservation Service and National Weather Service California -Nevada River Forecast Center, April -September forecast, 30 year average based on years 1981-2010. (5) Forecast by Department of Water and Power, City of Los Angeles, average based on years 1961-2010. (6) For the tributaries, the period of record over which the minimum values are found does not include years after water year 2011. .M 150 125 100 75 50 25 0 Jan 1 150 125 100 75 50 25 0 100 80 60 40 20 0 100 75 50 25 0 Snowpack Accumulation Water Content in % of April 1 Average Feb 1 Mar 1 Apr 1 May 1 Precipitation October 1 to Date in % of Average Smith Klamath Trinity Eel Russian oWY 2021 ■WY 2022 Reservoir Storage Contents of major reservoirs in % of capacity Klamath Trinity Eel Russian oWY 2021 ■WY 2022 Runoff October 1 to Date in % of Average Klamath, Trinity Eel Russian copes to Orleans OWY2021 ■WY2022 NORTH COAST REGION SNOWPACK - First of the month measurements made at 10 snow courses indicate an area wide snow water equivalent of 12.1 inches. This is 45 percent of the April 1 average. Last year at this time the pack was holding 11.6 inches of water. PRECIPITATION - Seasonal precipitation (October 1 through the end of January) on this area was 85 percent of normal. Precipitation last month was about 20 percent of the monthly average. Seasonal precipitation at this time last year stood at 55 percent of normal. RESERVOIR STORAGE - First of the month storage in 6 reservoirs was 1.0 million acre-feet which is 55 percent of average. About 35 percent of available capacity was being used. Storage in these reservoirs at this time last year was 70 percent of average. RUNOFF - Seasonal runoff of streams draining the area totaled 3.5 million acre-feet which is 80 percent of the average for this period. Last year, runoff for the same period was 25 percent of average. 7 Snowpack Accumulation Water Content in % of April 1 Average 150 125 100 75 50 25 0 1 Jan 1 Feb 1 Mar 1 Apr 1 May 1 Precipitation October 1 to Date in % of Average 150 125 100 75 50 25 0 Upper Feather Yuba American Sacramento ❑WY2021 MWY2022 Reservoir Storage Contents of major reservoirs in % of capacity 100 80 60 40 20 0 Sa°�mec�o "'00, �J�� 150 125 100 75 50 25 0 oWY 2021 ■WY 2022 Runoff October 1 to Date in % of Average Shasta Inflow Feather Yuba American oWY2021 ■WY2022 SACRAMENTO RIVER REGION SNOWPACK - First of the month measurements made at 70 snow courses indicate an area wide snow water equivalent of 19.7 inches. This is 75 percent of the April 1 average. Last year at this time the pack was holding 11.6 inches of water. PRECIPITATION - Seasonal precipitation (October 1 through the end of last month) on this area was 115 percent of normal. Precipitation last month was about 10 percent of the monthly average. Seasonal precipitation at this time last year stood at 50 percent of normal. RESERVOIR STORAGE - First of the month storage in 43 reservoirs was 7.9 million acre-feet which is 80 percent of average. About 50 percent of available capacity was being used. Storage in these reservoirs at this time last year was 75 percent of average. RUNOFF- Seasonal runoff of streams draining the area totaled 4.8 million acre-feet which is 95 percent of average for this period. Last year, runoff for the same period was 35 percent of average. The Sacramento Region 40-30-30 Water Supply Index is forecast to be 6.2 assuming median meteorological conditions for the remainder of the year. This classifies the year as "Dry" in the Sacramento Valley according to the State Water Resources Control Board. 93 Snowpack Accumulation Water Content in % of April 1 Average 150 125 100 75 50 25 0 _ , Jan 1 Feb 1 Mar 1 Apr 1 May 1 Precipitation October 1 to Date in % of Average 150 125 100 75 50 25 4o`Fe\oe8X01 o�oco°°�5bo�ao°`O `'�o9�a,Nos� 'Co"' �gP, 0 0 ❑WY 2021 NWY2022 Reservoir Storage Contents of major reservoirs in % of capacity 100 80 60 40 20 oe os os CPd yo gs eo °�g\om `'�os\a �oo\om hoc ac Not, �Jo 5 ❑WY 2021 ■WY 2022 Runoff October 1 to Date in % of Average 150 125 100 75 50 25 SAN JOAQUIN RIVER AND TULARE LAKE REGIONS SNOWPACK - First of the month measurements made at 66 San Joaquin River Region snow courses indicate an area wide snow water equivalent of 18.7 inches. This is 65 percent of the April 1 average. Last year at this time the pack was holding 13.5 inches of water. At the same time, 42 Tulare Lake Region snow courses indicated a basin -wide snow water equivalent of 13.5 inches which is 60 percent of the April 1 average. Last year at this time the basin was holding 7.1 inches of water. �oKo\om��os`a�Jo\Jyco405 n�osQo\c ❑WY 2021 ■WY 2022 9 PRECIPITATION - Seasonal precipitation (October 1 through the end of last month) on the San Joaquin Region was 105 percent of normal. Precipitation last month was about 0 percent of the monthly average. Seasonal precipitation at this time last year stood at 70 percent of normal. Seasonal precipitation on the Tulare Lake Region was 100 percent of normal. Precipitation last month was about 5 percent of the monthly average. Seasonal precipitation at this time last year stood at 50 percent of normal. RESERVOIR STORAGE - First of the month storage in 34 San Joaquin Region reservoirs was 5.4 million acre-feet which is 80 percent of average. About 45 percent of available capacity was being used. Storage in these reservoirs at this time last year was 90 percent of average. First of the month storage in 6 Tulare Lake Region reservoirs was 490 thousand acre-feet which is 70 percent of average and about 25 percent of available capacity. Storage in these reservoirs at this time last year was 55 percent of average. RUNOFF - Seasonal runoff of streams draining the San Joaquin Region totaled 1.3 million acre-feet which is 120 percent of average for this period. Last year, runoff for the same period was 20 percent of average. Seasonal runoff of streams draining the Tulare Lake Basin totaled 250 thousand acre-feet which is 70 percent of average for this period. Last year runoff for this same period was 25 percent of average. The San Joaquin Region 60-20-20 Water Supply Index is forecast to be 2.1 based on the 75 percent exceedance level forecast. This classifies the year as "Critical' in the San Joaquin Region according to the State Water Resources Control Board. 150 125 100 75 50 25 0 Jan 1 150 125 100 75 50 25 100 80 60 40 20 150 125 100 75 50 25 Snowpack Accumulation Water Content in % of April 1 Average Feb 1 Mar 1 Apr 1 May 1 Precipitation October 1 to Date in % of Average . ..... •o•��- �.crsmr mono ueatn Mojave Valley Truckee Walker Owens Valley Desert ❑WY 2021 ■WY 2022 Reservoir Storage Contents of major reservoirs in % of capacity I7uckee East Walker Mono Basin Owens Basin ❑WY 2021 ■WY 2022 Runoff October 1 to Date in % of Average Truckee- Carson Walker Owens Tahoe to Farad ❑WY 2021 ■WY 2022 NORTH AND SOUTH LAHONTAN REGIONS SNOWPACK - First of the month measurements made at 10 North Lahontan Region snow courses indicate an area wide snow water equivalent of 15.6 inches. This is 85 percent of the April 1 average. Last year at this time the pack was holding 10.1 inches of water. At the same time, 19 South Lahontan Region snow courses indicated a basin -wide snow water equivalent of 14.2 inches which is 70 percent of the April 1 average. Last year at this time the basin was holding 7.1 inches of water. PRECIPITATION- Seasonal precipitation (October 1 through the end of last month) on the North Lahontan Region was 140 percent of normal. Precipitation last month was about 10 percent of the monthly average. Seasonal precipitation at this time last year stood at 60 percent of normal. Seasonal precipitation on the South Lahontan Region was 85 percent of normal. Precipitation last month was about 0 percent of the monthly average. Seasonal precipitation at this time last year stood at 45 percent of normal. RESERVOIR STORAGE - First of the month storage in 5 North Lahontan reservoirs was 266 thousand acre-feet which is 60 percent of average. About 25 percent of available capacity was being used. Storage in these reservoirs at this time last year was 90 percent of average. First of the month storage in 8 South Lahontan reservoirs was 230 thousand acre-feet which is 90 percent of average and about 55 percent of available capacity. Storage in these reservoirs at this time last year was 90 percent of average. RUNOFF- Seasonal runoff of streams draining the North Lahontan Region totaled 168 thousand acre- feet which is 125 percent of average for this period. Last year, runoff for the same period was 40 percent of average. Seasonal runoff of the Owens River in the South Lahontan Region totaled 30 thousand acre-feet which is 80 percent of average for this period. Last year runoff for this same period was 65 percent of average. 10 100 75 50 25 100 80 so 40 20 200 175 150 125 100 75 50 25 Precipitation October 1 to Date in % of Average San Francisco Paiaro Salinas Santa Barbara Bay EIWY 2021 ■ WY 2022 Reservoir Storage Contents of major reservoirs in % of capacity North Bay Southeast Peninsula bannas aanca rue< Bay MY 2021 ■WY 2022 Runoff October 1 to Date in % of Average Napa nr St. Helena Arroyo Seco nr Nacimiento Soledad ❑Wy2021 mWY2022 SAN FRANCISCO BAY AND CENTRAL COAST REGIONS PRECIPITATION - Seasonal precipitation (October 1 through the end of last month) on the San Francisco Bay Region was 130 percent of normal. Precipitation last month was about 10 percent of the monthly average. Seasonal precipitation at this time last year stood at 50 percent of normal. Seasonal precipitation on the Central Coast Region was 105 percent of normal. Precipitation last month was about 0 percent.of the monthly average. Seasonal precipitation at this time last year stood at 80 percent of normal. RESERVOIR STORAGE - First of the month storage in 17 San Francisco Bay Region reservoirs was 469 thousand acre-feet which is 100 percent of average. About 65 percent of available capacity was being used. Storage in these reservoirs at this time last year was 85 percent of average. First of the month storage in 6 Central Coast Region reservoirs was 289 thousand acre-feet which is 55 percent of average and about 30 percent of available capacity. Storage in these reservoirs at this time last year was 65 percent of average. RUNOFF - Seasonal runoff of the Napa River in the San Francisco Bay Region totaled 44 thousand acre-feet which is 150 percent of average for this period. Last year, runoff for the same period was 0 percent of average. Seasonal runoff of streams draining the Central Coast Region totaled 126 thousand acre-feet which is 110 percent of average for this period. Last year runoff for this same period was 80 percent of average. 11 SOUTH COAST REGION PRECIPITATION - October through January (seasonal) precipitation on the region was 105 percent of normal. January precipitation was 5 percent of the monthly average. Seasonal precipitation at this time last year was 55 percent of normal. RESERVOIR STORAGE- January 31 storage in 29 major South Coast Region reservoirs was 1.12 million acre-feet or 85 percent of average. About 55 percent of available capacity was being used. Storage in these reservoirs at this time last year was 90 percent of average. RUNOFF- Seasonal runoff from selected South Coast Region streams was 35.1 thousand acre-feet which is 75 percent of average. COLORADO RIVER REGION SNOWPACK- The April 1 snowpack in the Upper Colorado River basin above Lake Powell was 60 percent of average. The snowpack ranges from 50 percent in the Escalante River basins to 65 percent in the Roaring Fork River basin. PRECIPITATION - October through January (seasonal) precipitation on the Colorado River -Desert Region was 35 percent of normal. Precipitation in January was 0 percent of average. Last year seasonal precipitation stood at 40 percent of normal. RESERVOIR STORAGE- On January 31, combined storage in Lakes Powell, Mead, Mohave and Havasu was about 17.5 million acre-feet or about 55 percent of average. About 35 percent of available capacity was in use. Last year at this time, these reservoirs were storing 60 percent of average. RUNOFF- The April -July inflow to Lake Powell is forecast to be 5.3 million acre-feet, which is 85 percent of median. 12 MAJOR WATER DISTRIBUTION PROJECTS RESERVOIR STORAGE (AVERAGES BASED ON 1991-2020 OR PERIOD RECORD) AVERAGE STORAGE AT THE END OF JANUARY RESERVOIR CAPACITY STORAGE 2021 2022 PERCENT PERCENT 1,000 AF 1,000 AF 1,000 AF 1,000 AF AVERAGE CAPACITY STATE WATER PROJECT Lake Oroville 3,538 San Luis Reservoir (SWP) 1,062 Lake Del Valle 77 Lake Silverwood 78 Pyramid Lake 180 Castaic Lake 325 Perris Lake 131 CENTRAL VALLEY PROJECT Trinity Lake 2,448 Lake Shasta 4,552 Whiskeytown Lake 241 Folsom Lake 977 New Melones Reservoir 2,400 Millerton Lake 521 San Luis Reservoir (CVP) 971 COLORADO RIVER PROJECT Lake Mead 26,159 Lake Powell 24,322 Lake Mohave 1,810 Lake Havasu 648 EAST BAY MUNICIPAL UTILITY DISTRICT Pardee Res 204 Camanche Reservoir 417 East Bay (4 res.) 159 CITY AND COUNTY OF SAN FRANCISCO Hetch-Hetchy Reservoir 360 Cherry Lake 274 Lake Eleanor 29 South Bay/Peninsula (4 res.) 238 CITY OF LOS ANGELES (D.W.P.) Lake Crowley 183 Grant Lake 48 2,056 1,239 1,642 80% 46% 812 644 588 72% 55% 32 30 38 118% 50% 66 66 67 101% 86% 164 153 153 93% 85% 255 253 185 73% 57% 93 122 106 114% 81% 1,558 1,249 763 49% 31% 2,965 2,129 1,621 55% 36% 203 206 206 101% 85% 449 290 533 119% 55% 1,392 1,555 993 71% 41% 310 166 277 89% 53% 715 416 315 44% 32% 16,456 10,510 8,970 55% 34% 14,447 9,638 6,335 44% 26% 1,666 1,691 1,661 100% 92% 557 557 578 104% 89% 178 188 175 99% 86% 254 254 218 86% 52% 123 115 128 104% 80% 230 197 294 128% 82% 193 192 240 124% 88% 14 10 22 156% 75% 155 174 182 117% 76% 118 118 112 95% 61% 28 25 14 48% 29% 13 TELEMETERED SNOW WATER EQUIVALENTS February 1. 2022 (AVERAGES BASED ON PERIOD RECORD) INCHES OF WATER EQUIVALENT BASIN NAME FEET APRIL 1 PERCENT APR 1 24 HRS 1 WEEK STATION NAME ELEV AVERAGE FE81 AVERAGE PREVIOUS PREVIOUS TRINITY RIVER Peterson Flat 7150 29.2 10.1 35% 10A 10.7 Red Rock Mountain 6700 39.6 16.7 42% 16.7 16.8 Bonanza King 6450 40.5 15.0 37% 15.0 15.5 Shimmy Lake 6400 40.3 11.1 27% 11.0 10.3 Middle Boulder 3 6200 28.3 9.8 34% 9.9 Highland Lakes 6030 29.9 13.1 44% 13.1 10.4 Scott Mountain 5900 16.0 5.5 34% 30 13.3 Mumbo Basin 5650 22.4 10.0 44% 10.0 34 9.7 Crowder Flat 5100 2.8 Big Flat 5100 15.8 9.6 - 61 % 2.8 9.6 2.6 SACRAMENTO RIVER 9.7 Cedar Pass 7100 18.1 8.9 49% 8.7 8.9 Blacks Mountain 7050 12.7 8.0 63% 8.0 Sand Flat 6750 42.4 10.9 26% 10.9 8.0 Medicine Lake 6700 32.6 13.0 40% 13.1 12.5 Adin Mountain 6200 13.6 9.5 70% 9.4 Snow Mountain 5950 27.0 277 103% 281 9.4 276 Slate Crack 5700 29.0 - Stouts Meadow 5400 3&0 21.4 59% 21.6 221 FEATHER RIVER Lower Lassen Peak 8338 - Kettle Rock 7300 25.5 - - _ Grizzly Ridge 6900 29.7 19.1 64% _ 19.1 _ 19.1 Pilot Peak 6800 52.6 2&0 53% 28.1 280 Gold Lake 6750 3&5 26.5 73% 26.5 26.4 Humbug 6500 28.0 23.5 84% 23.2 22.9 Harkness Flat 6200 28.5 16.3 57% 16.3 16.5 Rattlesnake 6210 14.0 13.7 98% 13.8 14.2 Bucks Lake 5873 44.7 33.8 76% 34.0 44.8 Four Trees EEL RIVER 5202 20.0 21.4 107% 21.5 23.0 Noel Spring 5100 - 3.6 - 4.0 YUBA & AMERICAN RIVERS 4.4 Schneiders 8750 34.5 _ - Lake Lois 8600 39.5 - - _ _ Carson Pass 8353 - 77.3 _ _ Caples Lake 8000 30.9 182 59% 17.3 18.1 17.4 Alpha Fomi 7600 35.9 17.2 48% 17.5 18.1 19.0 Ridge 7600 37.0 - Meadow Lake 7200 55.5 33.3 60% 33.3 33.4 Silver Lake 7100 22.7 15.0 66% 15.1 15.5 Central Sierra Snap Lab 6900 33.6 27.7 82% Van Mack 6700 35.9 24.3 68% 27.4 24.3 27.7 24.2 Huysink 6600 42.6 20.0 47% 20.0 20.2 Robinson Cow Camp 6480 - 27.3 Sunnyside Meadow 6300 - 43.7 - 27.3 27.6 Robbs Saddle 5900 21.4 14.3 - 67% 43.8 44.6 Greek Store 5600 21.0 15.6 74% 14.3 15.6 144 15.5 Blue Canyon 5280 9.0 17.2 191 % 17.0 16.7 Robbs Powerhouse 5150 5.2 14.0 270% 13.9 14.3 MOKELUMNE & STANISLAUS RIV Deadman Creek 9250 37.2 19.0 51 % 12.7 12.7 Highland Meadow 8700 47.9 - _ Gianelli Meadow B400 55.5 20.4 37% _ 20.4 _ 20.4 Lower Relief Valley 8100 41.2 23.4 57% 16.2 16.2 Blue Lakes Stanislaus Meadow 8000 7750 33.1 16.7 50% 16.8 16.7 Bloods Creek 7200 47.5 35.5 26.0 55% 17.0 17.0 Black Springs 6500 32.0 17.9 17.0 50% 53% 17.9 179 TUOLUMNE & MERCED RIVERS 17.0 17.3 Dana Meadows 9800 27.7 20.2 73% 15.0 15.2 Slide Canyon 9200 41.1 23.7 58% 23.6 23.1 Tuolumne Meadows 8600 22.6 14.4 64% 14.5 Horse Meadow 8400 48.6 - - 14.8 Ostrander lake 8200 34.8 20.6 59% _ 20.5 _ 20.6 Lake Tenaya 8150 33.1 17.6 53% 17.6 179 White Wolf 7900 - Paradise Meadow 7650 41.3 18.8 45% 18.8 18.9 Gin Flat 7050 34.2 12.7 37% 12.8 13.7 Lower Kibbie Ridge 6700 27.4 11.5 42% 11.5 12.4 14 SAN JOAQUIN RIVER - Volcanic Knob 10050 30.1 - - - - Agnew Pass 9450 32.3 37.8 - 18.1 48% 18.1 17.9 Kaiser Point 9200 Green Mountain 7900 30.8 - - 18.2 18.6 Devils Postpile 7569 - 18.0 12.5 - 41 % 12.6 12.2 Tamarack Summit 7550 30.5 57% 21.7 21.6 Chilkoot Meadow 7150 38.0 21.7 12.5 62% 12.5 12.6 Huntington Lake 7000 20.1 15.3 81% 15.3 15.4 Graveyard Meadow 6900 18.8 14.5 50% 18.5 18.6 Poison Ridge 6900 28.9 KINGS RIVER 11200 34.0 73.8 41 % 13.7 13.1 Bishop Pass 10400 27.5 20.5 75% 20.5 20.7 Charlotte Lake 10300 34.3 18.7 55% 18.5 18.5 Blackcep Basin 10300 29.0 15.9 55% 16.2 16.9 Stale Lakes 9900 32.9 22.0 67% 19.4 19.4 Mitchell Meadow 9700 34.6 20.2 58% 19.8 19.8 Upper Burnt Corral 9100 32.8 12.2 37 % 16.1 16.3 West Woodchuck Meadow 9.8 9.9 Upper Bull 8073 7600 - 24.6 9.7 24.4 - 99% 24.2 24.6 Big Meadows 13.1 13.2 13.4 Upper Providence 5611 - KAW EAH & TULE RIVERS - - Farewell Gap 9500 34.5 - 10.6 - 50% 10.7 11.2 Quaking Aspen 7200 21.0 6.1 61% 7.8 8.3 Giant Forest 6650 10.0 KERN RIVER 11400 27.7 11.6 42% 8.1 8.1 Upper Tyndall Crack 10700 19.8 10.0 51% 10.0 &3 Crabtree Meadow 21.8 10.6 49% 10.5 10.6 Chagoopa Plateau 10300 17.9 72% 17.9 13.8 Pascoes 9150 8950 24.9 30.3 10.4 34% 10.4 11.3 Wet Meadows 8900 15.6 6.9 44% 6.2 6.5 Tunnel Guard Station 10.5 50% 10.5 10.5 Casa Vieja Meadows 8300 20.9 4.9 45% 5.2 6.1 Beach Meadows 7650 11.0 SURPRISE VALLEY AREA 18.2 62% 18.2 18.4 Dismal Swamp 7050 29.2 TRUCKEE RIVER 7600 24.6 24.4 99% 24.2 24.6 Big Meadows 8450 41.4 33.1 800/0 33.3 33.1 Independence Lake 8200 46.5 21.4 46% 21.2 21.0 Palisades Tahoe 7000 21.8 17.7 81% 17.8 17.7 Independence Camp 10.0 79% 10.1 10.0 Independence Creek 6500 12.7 13.5 94% 13.5 13.4 Truckee 2 6400 14.3 LAKE TAHOE BASIN 38.5 26.7 69% 26.6 Mount Rose Ski Area 8900 15.6 56% 15.7 15.9 15. Heavenly Valley 8800 28.1 21.1 15.5 73% 15.7 15.5 MaLake 8000 8000 16.5 13.2 80% 13.1 14.1 Hagans ans Meadow 7800 39.5 28A 71 % 28A 27.9 Echo Peak 5 7500 29.1 18.2 63% 18.2 18.3 Rubicon Peak 2 6750 39.4 20.9 53% 20.9 20.9 Ward Creek 3 6750 16.0 11.1 69 % 10.7 112 Tahoe City Cross 7.0 8.4 120% 8.5 8.5 Fallen Lest Lake 6250 CARSON RIVER 38.8 17.6 45% 17.1 17.4 Ebbetts Pass 8700 Horse Meadow 8400 48.6 - - 10.8 11.0 Monitor Pass 8350 - 10.7 - 15.4 15.6 Burnside Lake 8129 - 15.2 - 209 209 Forestdale Creek 8017 - 20.7 13.2 81% 13.4 13.1 Poison Flat 7900 16.2 5.5 122% 5.2 5.6 Spratt Crack 6150 4.5 WALKER RIVER 36.0 - 36.3 36.3 Leavitt Lake 9600 - 11.4 - 11.5 11.6 Summit Meadow 9313 - 20.3 9.9 49% 10.1 10.1 Virginia Lakes 9300 17.3 9.3 549/. 9.3 9.6 Lobdell Lake 9200 8750 26.0 11.6 45% 11.7 11.6 Sonora Pass Bridge 8.5 106% 7.8 8.5 Leavitt Meadows 7200 8.0 OWENS RIVERIMONO LAKE 70 % 21.9 22.0 Gem Pass 10750 31.7 22.1 10.6 55% 10.6 10.8 Sawmill 10200 19.4 8.3 72% 8.4 8.5 Cottonwood Lakes 10150 11.6 12.1 68% 12.2 11.2 Big Pine Creek 9800 17.9 9.6 68% 8.5 8.7 Rock Creek Lakes 9700 14.0 9.3 58% 9.3 9.2 South Lake 9600 16.0 42.4 28.8 fib% 20.9 20.9 Mammoth Pass 9300 ACCUMULATION EXPRESSED AS A PERCENT OF APRIL IST AVERAGE NORMAL SNOWPACK AREA JANUARY FEBRUARY MARCH APRIL MAY Central Valley North 45% 70% 90% 100% 100% 75/0 80% Central Valley South 45% 65% 60% 85% 85 % 100% 80% North Coast 40 % 16 250 200 9 DEPARTMENT OF WATER RESOURCES CALIFORNIA COOPERATIVE SNOW SURVEYS February 1 Statewide Conditions -" ' --•` `�� Vl� cvis tvio ZU11 2018 2019 2020 2021 2022 oSnowpack ®Precipitation � Runoff to Date -#.-ReservoirStorage SNOWLINES Track the latest water conditions in California by accessing California Water Watch. It offers the most current local and statewide water conditions down to your region and even your neighborhood. Information is updated dynamically from a variety of data sources. Access it at the link below. hftps://cww.water.ca.gov Depicted on this month's cover is a high -resolution photo aboard an Airborne Snow Observatories, Inc. data acquisition flight from 23,000 feet in the air during the first week of February 2022. 16 ® OSP 22 152926 SNOWPACK— Snow data is a major index of spring and summer runoff from Sierra Nevada watersheds. April 1 data historically reflects the magnitude of the snowpack at or near the maximum seasonal accumulation. Averages are based on April 1 data for the period 1991-2020 (30 years, except for data sites with insufficient data). PRECIPITATION — Averages for stations are based on the source of the data and varies from a 30-year to a 50-year period. RUNOFF AND FORECASTS — Runoff data and runoff forecasts are shown as unimpaired values. Unimpaired runoff represents the natural water production of a river basin, unaltered by upstream diversions, storage, or by export or import of water to or from other watersheds. Forecast of runoff assumes median conditions subsequent to the date of forecast. Runoff probability ranges are statistically derived from historical data. The 80 percent probability range is comprised of the 90 percent exceedance level value and the 10 percent exceedance level value. This means that actual runoff should fall within the stated limits eight times out of ten. Runoff averages for most streams are based on the period 1991-2020. Reservoir storage averages are based on the period from 1991 (or beginning of operation) to 2020. For more details contact California Cooperative Snow Surveys, P.O. Box 219000, Sacramento, CA 95821-9000, or the Manager of the Snow Surveys and Water Supply Forecasting Section Sean de Guzman at (916) 574-2208 or sean.deguzman@water.ca.gov. INDICES OF WATER AVAILABILITY The Sacramento River water year unimpaired runoff_ is the sum of: Sacramento River above Bend Bridge, Feather River Inflow to Lake Oroville, Yuba River near Smartsville and American River Inflow to Folsom Lake. The Sacramento Valley Water Year Hydrologic Classification (40-30-30 Index) The values 40-30-30 represent the percentage weight given to the three variables in the formula for the index. The first variable is the forecasted unimpaired runoff from April through July (40 percent). The second variable is the forecasted unimpaired runoff from October through March (30 Percent). The third variable is the previous year's index with a cap to account for required flood control releases during wet years. The basins used in this computation are those used in the Sacramento River water year unimpaired runoff. The San Joaquin Valley Water Year Hydrologic Classification (60-20-20 Index) In a similar manner the values 60-20-20 represents the percentage weights on April through July runoff, October through March runoff and previous year's Index. The San Joaquin River unimpaired runoff is the sum of: Stanislaus River Inflow to New Melones Lake, Tuolumne River Inflow to New Don Pedro Reservoir, Merced River Inflow to Lake McClure and San Joaquin River Inflow to Millerton Lake. is the sum of the runoff in the eight major rivers used in the two above indices. HOW TO STOP RECEIVING BULLETIN 120 If you would no longer want to receive a hard copy of the Bulletin 120, please send an email to the Manager of the Snow Surveys and Water Supply Forecasting Unit Sean de Guzman at sean.deguzman@water.ca.gov informing him you no longer want to receive a copy. Our team will remove you from our mailing list. State of California — The Natural Resources Agency DEPARTMENT OF WATER RESOURCES P.O. Box 942836 Sacramento, CA 94236-0001 First Class BUTT E C. ADMINlS1 1w 16 26 0WVAJ.E.C&H0RN1A FIRST CLASS MAIL U.S. POSTAGE PAID SACRAMENTO CA PERMIT NO 424 BUTTE COUNTY CHAIRMAN -BD OF SUPERVISORS 25 COUNTY CENTER DR OROVILLE CA 95965-3316