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Grand Coulee Dam is a gravity dam on the Columbia River in the U.S. state of Washington, built to produce hydroelectric power and provide irrigation water. It was constructed between 1933 and 1942, originally with only two powerhouses.
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Hi There. Grand Coulee Dam provides water to irrigate approximately 600,000 acres in the Columbia Basin Project. In addition to its irrigation and power functions, Grand Coulee Dam is a primary factor in controlling the floods on the Columbia River.

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