List of dams and reservoirs in Washington

As of 2023[update], the U.S. state of Washington has 1,242 dams that are able to impound 10 acre-feet or more of water and are regulated by the Washington State Department of Ecology (DOE).

These include dams that produce hydroelectricity and create reservoirs for irrigation, drinking water, or recreational uses.

[1] Proposals to remove underused dams and restore fish habitats emerged in the early 21st century with support from the state's Native American tribes; the first major dam removal was the Condit Dam near White Salmon in 2011, which was followed by two dams on the Elwha River near Port Angeles.

[2] The largest dam in Washington, in terms of structural volume, reservoir capacity, and electricity production, is the Grand Coulee Dam on the Columbia River.

It is the largest power station in the United States with a nameplate capacity of 6,809 megawatts and one of the largest concrete structures in the world.