Eighty miles west of Spokane, the immense Grand Coulee Dam is the country’s largest concrete structure. Constructed between 1933 and 1942 on the Columbia River, the dam was one of the cornerstones of FDR’s New Deal, and remains one of the world’s top generators of hydroelectricity. Heroic tales of power production are detailed in the visitor centre, on Hwy-155 on the west side of the dam, which also runs free 50min tours (April–Oct daily) of the dam and one of its massive generating plants.

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