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Scope/Content: Abstract: The purpose of the feasibility portion of the Planning, Design, and Analysis (PDA) phase is to determine the feasibility and costs of various alternatives and recommend a single alternative that will enable fish passage through and upstream of York Creek Dam. Presently, steelhead are unable to access habitat upstream of the dam because of direct blockage of the dam. The existing fish ladder is inoperable and does not tie in to the creek below and above the dam. Water presently flows down a standpipe behind the dam and exits through an outlet pipe at the base of the dam. Primary objectives of this project are to improve fish passage in Upper York Creek, restore fluvial processes and decrease the risk of uncontrolled sediment releases at the dam, and to restore approximately two acres of habitat and connection between downstream and upstream of the dam. Secondary objectives of the project include the minimization of operations and maintenance activities and environmental impact, in addition to reducing erosion in the stream corridor. This appendix presents the hydrologic and hydraulic information for three alternatives: complete removal of Upper York Creek Dam, partial dam removal, and construction of a new fish ladder through the existing dam. Scope/Content: Height: 50 Length: 140 Scope/Content: Date constructed: 1900.
Alternative analysis Dams Dam retirement
Napa River, CA York Creek, CA Upper York Creek Dam United States