Patterson Valve Exercise (OM-DFD-2026-018)

Department of Water Resources DWR Division of Safety of Dams will perform a valve exercise at the Patterson Dam outlet works consisting of a butterfly valve BFV, a steel conduit, a downstream BFV, and concrete conduit that conveys water to the outlet dissipation structure. The downstream BFV associated with the low-level outlet will be exercised by fully opening and closing. To avoid a sudden release of water to the drainage ditch, the steel conduit between both valves will require dewatering. T...