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The Chief Joseph Dam, a concrete gravity dam on the Columbia River near Bridgeport, 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).
Mossyrock Dam is a concrete arch-gravity dam on the Cowlitz River near Mossyrock in Lewis County, Washington, United States. The reservoir created by the dam is called Riffe Lake . The primary purpose of the dam is hydroelectric production while flood control is a secondary function. [ 1 ]
The primary goal of this project was the removal of the 108 ft (33 m) Elwha Dam and the 210 ft (64 m) Glines Canyon Dam from the Elwha River on the Olympic Peninsula of Washington state. Elwha Dam was built privately from 1910 to 1912 by Thomas Aldwell , who owned land in the area. [ 7 ]
Little Goose Lock and Dam is a hydroelectric, concrete, run-of-the-river dam in the northwest United States, on the lower Snake River in southeast Washington. At the dam, the river is the border between Columbia and Whitman counties ; [ 2 ] it is nine miles (14 km) northeast of Starbuck and 25 miles (40 km) north of Dayton .
Gorge Dam is one of three along the upper Skagit River in Whatcom County, Washington, and part of the Skagit River Hydroelectric Project that supplies Seattle with some of its power needs. Construction on the original wooden Gorge Dam began in 1921, with its generators formally started by President Calvin Coolidge on September 17, 1924. [ 1 ]
Lower Granite Lock and Dam is a concrete gravity run-of-the-river dam in southeastern Washington in the United States. On the lower Snake River , it bridges Whitman and Garfield counties. [ 6 ] Opened 50 years ago in 1975, [ 1 ] [ 7 ] [ 8 ] the dam is located 22 miles (35 km) south of Colfax and 35 miles (56 km) north of Pomeroy .
O'Sullivan Dam located near the bottom of Potholes Reservoir. O'Sullivan Dam (National ID # WA00268), one of the largest earthfill dams in the United States (200 ft/61 m high; 19,000 ft/5,791 m long; completed 1949), is on Crab Creek in the U.S. state of Washington, about 45 km south of Ephrata and 25 km south of Moses Lake.
Howard A. Hanson Dam is an earthen embankment dam on the Green River, 21 miles (34 km) east of Auburn, Washington. The dam was completed in 1961 and its primary purpose is flood control along with water supply for Tacoma, Washington .