Grand Coulee Dam

Grand Coulee Dam is a hydroelectric gravity dam on the Columbia River in Washington. It is the largest electric power producing facility in the United States, and the largest concrete structure in the U.S. When completed in 1941, it was the largest manmade structure ever built. The reservoir it backs up is called Franklin Delano Roosevelt Lake, named after the United States president who presided over the conception and completion of the dam.

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April 10, 2026

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