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Grand Coulee Dam Location: Grand Coulee, Washington Columbia River mile: 596.6 Operator: U.S. Bureau of Reclamation Type: Dam and storage, reservoir, pumped storage reservoir Completed: 1941 (18 turbine units); 1982 ( 6 turbine units) Generating capacity: 6,620 megawatts Juvenile fish passage facilities: (none) Additional notes: Chief Joseph and Grand Coulee dams lack any fish passage facilities and thus permanently block anadromous fish from the upper Columbia River Basin More info about this dam (off-site link)