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Grand Coulee Dam is a hydroelectric gravity dam on the Columbia River in the U.S. state of Washington. It is the largest electric power producing facility and the largest concrete structure in the United States. The reservoir is called Franklin Delano Roosevelt Lake, named after the United States president who presided over the completion of the dam. The foundation was built by the MWAK Company, a joint effort of several contractors united for this purpose. Consolidated Builders Incorporated, including industrialist Henry J. Kaiser, completed the dam. The United States Bureau of Reclamation supervised the contractors and operates the dam. The Grand Coulee Dam is almost a mile long. It is taller than the Great Pyramid of Giza; all the pyramids at Giza could fit within its base. It is more than twice as tall as Niagara Falls. Facts: Largest concrete dam in North America, largest concrete structure in the United States with 11,975,521 yd³ (9,155,94 2 m³) used[citation needed] Hydraulic Height: 380 ft (116 m) Height of Dam from Bedrock: 550ft Reservoir Lake Roosevelt stretches for 151 mi Average release: 110,000 ft³/s (3,100 m³/s) 4 power plants, 33 generators Installed generating capacity: 6809 MW [10]