Columbia basin project

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Columbia basin project,

central Wash., a multipurpose development of the U.S. Bureau of Reclamation providing irrigation, hydroelectric power, and flood control. Its key unit, the Grand Coulee DamGrand Coulee Dam
, 550 ft (168 m) high and 4,173 ft (1,272 m) long, on the Columbia River, N central Wash., NW of Spokane; built 1933–42 as a key unit in the Columbia basin project of the U.S. Bureau of Reclamation.
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, provides the project with power and pumps the waters of the Columbia River into an irrigation system comprising a series of lakes, reservoirs, and numerous canals. Irrigation was begun in 1948. In 1969 the project had an installed hydroelectric power generation capacity of 2,333,000 kW. O'Sullivan Dam (200 ft/61 m high; 19,000 ft/5,791 m long; completed 1949) on Crab Creek, the project's southernmost dam, is one of the largest earthfill dams in the United States and impounds Potholes Reservoir.
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The wasteway water comes from the Columbia Basin Irrigation Project, which begins at Grand Coulee Dam.

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