Final environmental assessment released for Kachess Safety of Dams modification project

26 September 2022

The US Bureau of Reclamation has released the final environmental assessment and finding of no significant impact for the Kachess Dam safety project. 

Reclamation analyzed cost-effective measures to reduce long-term risks, per Reclamation’s Public Protection Guidelines, to maintain water deliveries throughout the Yakima basin, minimize impacts to the environment, and continue water flows for endangered species. The project area is located in Kittitas County, two miles north of Easton.  

Reclamation selected the proposed action to reduce long-term risks by constructing an access road; preparing the site to develop staging areas to support construction and long-term maintenance; extend and line the conduit; and install a filter and stabilization berm.

Kachess Dam is performing as designed said USBRm stressing that there is no immediate safety threat - the modifications address issues important to the long-term functionality. USBR said it rigorously monitors the dam for any changes in performance. 


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