HomeMy WebLinkAboutLake Oroville Spillways Construction Updates Menchaca, Clarissa
From: DWR Oroville Spillways <oroville@water.ca.gov>
Sent: Wednesday, March 21, 2018 6:49 PM
To: Menchaca, Clarissa
Subject: Lake Oroville Spillways Construction Updates
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March 21, 2018
The San Francisco Chronicle calls Lake Oroville "...one of Butte County's biggest draws."
Check out their recent article, "Easy ways to enjoy Lake Oroville's watery wonders," which
highlights the many recreation opportunities at Lake Oroville.
Today the Department of Water Resources (DWR) provided an update on construction
activities for the Lake Oroville Spillways Emergency Recovery Project.
Construction at the Emergency Spillway
• The underground secant pile cutoff wall was completed March 7, 2018 and marks a
major milestone for 2018 construction. The secant pile wall is 1,450 feet long and
located 730 feet downhill of the emergency spillway at depths of 35 to 65 feet.
• On February 28, crews began construction of the roller-compacted concrete (RCC)
splashpad, which will cover the hillside between the emergency spillway and secant
pile wall. The splashpad, in conjunction with the secant pile wall, will armor the existing
terrain to significantly reduce the type of uphill erosion that occurred during the
February 2017 incident.
• Later this year, an RCC buttress will be constructed adjacent to the emergency
spillway to provide further reinforcement.
Construction on the Main Spillway
Phase Two of construction on the main spillway is expected to begin in May and is dependent
on weather. This year's work includes:
• Demolition of the original 730 feet of the upper chute leading to the radial gates and
reconstruction with steel-reinforced structural concrete slabs and walls.
• Placement of 2.5-foot, steel-reinforced structural concrete slabs over the RCC middle
chute.
• Removal of the RCC walls in the middle chute and replacement with structural
concrete walls.
• Hydro-blasting and resurfacing of the energy dissipaters at the base of the main
spillway.
DWR also began conducting early preparation work on the RCC middle chute by temporarily
sealing its surface. Later this spring, crews will begin resurfacing the top layer of RCC to create a
uniform surface before placement of steel-reinforced structural concrete slabs.
Additional Updates
• At the request of the Federal Energy Regulatory Commission (FERC), DWR submitted
its outline to address recommendations and findings in the Independent Forensic
Team's final report.
• The 2017118 Lake Oroville Winter Operations Plan will be updated after DWR's April 1
snowpack survey. The updated Plan will account for snowpack runoff forecasts and
reservoir conditions for the remainder of the rainy season.
• DWR will meet with the Independent Board of Consultants (BOC) for the 16th time on
March 28 and 29. DWR will post the BOC's memo recapping this meeting on the Lake
Oroville spillways webpage when it is received.
• How are decisions about lake levels and reservoir releases being made this winter?
Watch this short video from DWR's Water Operations Office, posted March 13, 2018.
To view photos and video of the Lake Oroville Spillways construction, visit DWR's Oroville
Spillway photo g aq llery and YouTube channel.
For more information, follow us on Twitter or Facebook, read our news releases or visit our
Oroville Spillway Incident web a e.
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California Department of Water Resources
1416 9th St.
Sacramento, CA 95814
Call our general information line at 1-800-248-7026
or email us at orovilleOwater.ca.gov
This email was sent to cmenchaca@buttecounty.net.To unsubscribe, click here.
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