The Grand Coulee Dam is a hydroelectric gravity dam on the Columbia River in the U.S. state of Washington. In the United States, it is the largest electric power producing facility and the largest concrete structure. It is the seventh largest producer of hydroelectricity in the world, as of the year 2008.The Grand Coulee Dam is almost a mile long at 5223 feet (1586 m). The spillway is 1,650 feet (503 m) wide. At 550 feet (168 m), it is taller than the Great Pyramid of Giza; all the pyramids at G...
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