Hydroelectric Information for Columbia and Snake River Projects

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Grand Coulee Dam - General Information

Dam: Grand Coulee Dam. Columbia River. River Mile 596.6

Constructed: 1942; modified in 1974, 1982, and 1984

Owner: U.S. Bureau of Reclamation

Normal Full Pool: 1290.0 feet

Normal Minimum Pool: 1208.0 feet

Powerhouse Capacity:

Nameplate capacity¹: 18 @ 125 MW, 3 @ 600 MW, 3 @ 805 MW, 6465 MW total

Station service units: 3 @ 10 MW, 30 MW total

Pump/Generator units¹: 2 @ 50.0 MW, 4 @ 53.5 314 MW total

Hydraulic capacity: 280 kcfs

Spillway: 11 Drum Gates, 40 Outlet Tubes (2 gates each outlet)

For more information

• Visitor Information: see Grand Coulee Dam Visitor Information page, US Bureau of Reclamation, Grand Coulee Dam
• USBR page for Grand Coulee Dam
• USBR page for detailed powerplant information
• USBR, Dams, Projects & Powerplants page for project statistics