Image Source: USACE, Portland District

General Information

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 Pool¹:

335.0-340.0 feet

Maximum Pool¹:

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

¹ From USACE Walla Walla District, Structural Details Map.

Additional Information

McNary Dam web page.Contact U.S. Army Corps of Engineers, Walla Walla District for all additional information.