Folsom Dam - Safety of Dams Project
The current preferred modification alternatives to reduce dam safety risks at the Folsom Facility to acceptable levels include construction of a new auxiliary spillway, construction of crest filters at the Left Wing Dam and Right Wing Dam, construction of filters and berms at Dikes 4, 5, and 6, foundation stabilization and Stability berm construction at Mormon Island Auxiliary Dam and at the main concrete structure gate and pier reinforcement. These alternatives comprise the least cost technically viable solution that reduces the risk of dam failure to below Reclamation’s guidelines, ensure continued structural integrity under all operating conditions, and maintain full project benefits at current levels.
Additionally, Reclamation and the Corps have developed a Joint Federal Project (JFP) to achieve respective agency objectives (hydrologic risk reduction and flood damage reduction). Pending anticipated full authorization by the Corps, the JFP auxiliary spillway will be fully constructed resulting would be a spillway that meets the needs of both agencies and allows both agencies to save costs. Reclamation is proceeding with initial phases of construction pending full Corps authorization and further design work.