This project funded an assessment of the project reach to determine factors involved with sediment transport and deposition and developed a final design for needed improvements to the diversion dam that would properly optimize sediment transport and minimize the need for mechanical sediment removal during the fish migration window in the spring months. Existing data and documents were used along with new data to determine river hydraulics, bedload transport, habitat, and fish use. Local, State, Tribal and Federal fishery agencies were consulted throughout the process. Steelhead, Chinook salmon, and bull trout stand to benefit from the project once implemented. The Gardena Farms Diversion Dam and Fish Passage Improvement Project is located near river mile 37 on the Walla Walla River in Touchet, Washington. The diversion dam builds diversion head using flashboards placed between vertical H-beams. Flashboards are placed and removed by hand using a trolley car and hand tools or from the downstream apron of the dam during low flow. Hand removal of flashboards is not possible during higher flow. Sediments are deposited annually in the diversion dam forebay and below the dam during high flow events. This material partially or wholly blocks the irrigation diversion gates which are part of downstream passage and fish ladder entrances and exits. Sediments are removed 1 to 4 times per year by mechanical means (excavator) and sediment deposition above the dam and ladder is forcing the river to crowd and erode the north bank.