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Limits RegistryCompleted in its original form in 1942 and substantially expanded with a third powerhouse in 1974, Grand Coulee was central to the mid-20th-century industrialization of the U.S. Pacific Northwest, providing power for wartime aluminum production and, later, large-scale irrigation of the Columbia Basin. It remains operated by the U.S. Bureau of Reclamation and is one of the largest hydroelectric facilities outside China and South America.
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Completed in its original form in 1942 and substantially expanded with a third powerhouse in 1974, Grand Coulee was central to the mid-20th-century industrialization of the U.S. Pacific Northwest, providing power for wartime aluminum production and, later, large-scale irrigation of the Columbia Basin. It remains operated by the U.S. Bureau of Reclamation and is one of the largest hydroelectric facilities outside China and South America.
The Grand Coulee Dam on the Columbia River in Washington State, USA, has a total installed generating capacity of 6,809 MW, making it the largest power station of any kind in North America and the largest concrete structure built in the United States.
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Limits Registry. LR-GRAND-COULEE-DAM. Grand Coulee Dam — largest power station in North America. 2026.