Hydroelectric Information for Columbia and Snake River Projects

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McNary Dam - General Information

Image Source: USACE, Portland District

Dam: McNary Dam. Columbia River. River Mile 292.0

Constructed: 1957; second powerhouse deauthorized 1991

Owner: U.S. Army Corps of Engineers, Walla Walla District

Normal Operating Pool ¹: 335.0-340.0 feet

Maximum Pool ¹: 356.5 feet

Powerhouse Capacity:

Nameplate capacity: 14 @ 70 MW, 980 MW total

Overload capacity: 14 @ 80.5 MW, 1127 MW total

Station service units: 2 @ 3 MW, 6 MW total

Hydraulic capacity: 232 kcfs

Spillway: 1310, 22 gates

• Visitor Information: see McNary Dam Visitor Center page, USACE Walla Walla District
• USACE Walla Walla District for information, history and color photo.
• USACE Walla Walla District for Pertinent Data (including stats on cost, reservoir, spillway, and powerplant).
• USACE Hydroelectric Design Center for detailed hydroplant (pdf) information.