Matilija Dam | Rogue River | Nelson Dam

Naches River Watershed—Nelson Dam

The Nelson Dam is an 8-foot irrigation diversion dam on the Naches River in Washington, just upstream of the City of Yakima on an important salmon bearing river that is the largest tributary to the Yakima River, which flows into the Columbia River. This project will involve the replacement of the dam with a roughened channel, which is a proven and technically innovative structure that will allow free passage of fish and increase sediment flow which will improve floodplain habitat upstream and downstream in areas important for fishery spawning and rearing. Removal of the dam also will reduce flood risks to the community, and decrease costs for operating irrigation diversions. This project is part of a broader effort to implement the Yakima Basin Integrated Plan, which is supported by agencies, irrigations districts, nonprofit organizations, and the business community, to advance a fully-functioning watershed.