Oroville Dam Service Spillway (P-2100)

Incident Description

Major damage occurred to the Oroville Dam Service Spillway during spillway operation on February 7, 2017. Additionally, due to high inflows and reduced service spillway capacity, the ungated emergency spillway saw overtopping flow beginning on February 11, 2017, for the first time. Excessive erosion of the bedrock downstream of the emergency spillway threatened the stability of the structure on February 12, 2017. The reservoir was immediately lowered using the service spillway to prevent potential erosion of the emergency spillway’s foundation.

• January 26, 2018 – Letter from FERC to exemptees/licensees with Owner’s Dam Safety Programs on Oroville Dam Independent Forensic Findings 
   
• January 10, 2018 – Letter from FERC regarding Forensic Report and Plan of Action for Oroville Dam 
  • Independent Forensic Team Report Oroville Dam Spillway Incident 
• June 22, 2017 – Generic letter from FERC on new focused spillway assessments 
   
• June 22, 2017 – Frequently asked questions for spillway inspections
   
• May 16, 2017 – Letter from FERC, regarding Replacement Members for Board of Consultants 
   
• May 11, 2017 – Letter from DWR, regarding Proposed Members of Independent Board of Consultants 
   
• May 3, 2017 – Letter from FERC, regarding the Forensic Review Team for Oroville Dam Spillway 
   
• March 31, 2017 – Letter from FERC, regarding Designation of Non-Federal Representative for Consultation 
   
• March 24, 2017 – Letter from DWR, regarding Independent Forensic Review with preliminary schedule 
   
• March 24, 2017 – Letter from DWR, regarding National Marine Fisheries Service (NMFS) letters 
   
• March 20, 2017 - Letter from FERC to DWR, regarding Forensic Team 
   
• March 17, 2017 - Letter from DRW, regarding Independent Board of Consultants. Memorandum No. 1 
   
• March 3, 2017 - Interview with Acting Chairman Cheryl LaFleur at Oroville Dam, recorded March 1, 2017 Podcast 
   
• February 28, 2017 – Letter from NMFS, regarding Fish Resources 
   
• February 24, 2017 – Letter from NMFS, regarding Feather River Diversion Pool 
   
• February 21, 2017 - Letter from FERC to DWR, approving the Independent Board of Consultants and outlining next steps 
   
• February 18, 2017 - Letter from DWR, naming the Independent Board of Consultants and the next steps 
   
• February 14, 2017 - Acting Chairman LaFleur's Statement on Oroville Dam Situation Read More
   
• February 13, 2017 - Letter to the DWR, regarding Emergency Repair and Board of Consultants for Oroville Dam Spillway