Nelson Dam before – 3-16-20

Nelson Dam removal as of 4-19-23

Work on the Nelson Dam removal and replacement project began in August 2021. The project will improve fish passage and sediment continuity to improve habitat, increase flow conveyance to decrease flooding risks for nearby landowners, and improve water supply reliability.

Nelson Dam, on the Naches tributary of the Yakima River, was built in the 1920s to divert irrigation water for Yakima and the Naches-Cowiche Irrigation Association. The original design did not allow any fish passage. The dam has held back tons of sediment and silt over the years, raising the river bed and causing the Naches River to overflow its banks and move into the surrounding community during even minor flooding.

The Washington Dept. of Fish and Wildlife detailed how fish are being saved even as water levels are lowered to allow workers to carry out the project.

The City of Yakima and Yakima County have been collaborating on the design and implementation of this project. The dam removal and replacement is one of several major public works projects initiated by the Yakima Basin Integrated Plan.

The City of Yakima is investing $10.8 million in the $26 million multi-agency collaboration — part of the Yakima Basin Integrated Plan — over the next four to five years.

The City of Yakima plans to invest $10.8 million in the $26 million, multi-agency collaboration over the next four to five years. To help pay for the project, the City of Yakima received $4.4 million from Washington State’s Floodplain by Design program, $4.134 million from Washington State’s Brian Abbott Fish Barrier Removal Board, $1.325 million from the state’s Capital Budget and $500,000 from both the Resource Legacy Fund and the Bureau of Reclamation.

The Nelson Dam removal/replacement project began July 2021 and scheduled for completion April 2023.

The project was among those featured in a 2022-year-in-review publication by the Bureau of Reclamation. A copy is available at Yakima Basin Integrated Plan 2022 Highlights (usbr.gov)

For more about the project, contact Interim Water/Irrigation Manager Mike Shane at 509-576-6480 or by email at ave Brown by phone at 509-575-6154 or by email at Mike.Shane@yakimawa.gov