A diagram shows an overhead view of the Sacramento Weir fish passage structure, displaying the dual-channel design with flow control gates, fish ladder and baffle system. The "double hybrid technical fishway" developed by the U.S. Army Corps of Engineers Sacramento District features separate channels that can operate independently or together based on flood conditions. The design allows endangered salmon, steelhead and sturgeon to navigate safely through the flood control infrastructure during high-water events. (Courtesy Diagram)