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Grand Coulee Dam, Washington


Seven Modern Wonders of the World, 1955

Grand Coulee DamCompleted in 1941, this gravity dam is the largest concrete structure and hydroelectric facility in the United States. This project also provides primary flood control for the entire Columbia River basin, and offers significant irrigation and recreation benefits. The dam was named an ASCE International Historic Civil Engineering Landmark in 1997.

Learn more about the history of the Grand Coulee Dam.