Lake Oroville Spillways Construction Updates December 21, 2017

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SACRAMENTO – Construction activities continue on the Lake Oroville Spillways Emergency Recovery Project. The following is a construction update from the Department of Water Resources (DWR):

Construction on the Main Spillway

  • Kiewit has completed concrete dry-finishing work for the season on the main spillway.
  • The majority of drainage system work will be completed by the end of 2017. Some temporary drain configurations in the middle chute will be kept in place until the roller-compacted concrete (RCC) walls are replaced with structural concrete walls and a permanent drain system next year.
  • Finishing work on the final shotcrete layer of the temporary RCC walls and the enriched overlay on the temporary RCC chute continues over the next few weeks to ensure a smooth surface.
  • Construction will resume on the main spillway in spring 2018. The exact date will be based on weather.


Construction at the Emergency Spillway

  • Work continues at the emergency spillway. Crews have completed approximately 70 percent of the secant pile wall, and full completion is now expected by mid-March 2018.
  • The expected completion date has been adjusted to account for additional drilling and structural concrete placement.


Forensic Team Report Update

  • Earlier this month, the Independent Forensic Team released a statement to the media saying the final report would not be completed for several weeks.
  • The IFT recently notified DWR that it is now targeted for completion in January 2018.
  • The final report will include the IFT’s previous findings regarding the physical factors as well as new findings on the human factors that contributed to the February incident. The report will be made public.


Oversight Update

  • DWR posted memo #14 from the independent Board of Consultants recapping the 14th meeting on Nov. 30 and Dec. 1. DWR is scheduled to meet with the BOC for the 15th time in late-February 2018.

 To view photos and video of the Lake Oroville Spillways construction, visit DWR’s Oroville Spillway photo gallery and YouTube channel.


 For more information, follow us on Twitter or Facebook, read our news releases or visit our Oroville Spillway Incident webpage.


Erin Mellon, Assistant Director, Department of Water Resources, Public Affairs

(916) 651-2440 |