Lower Granite Dam - Hydroelectric Project Information

Lower Granite Dam image
Image Source: USACE Digital Visual Library

General Information

Dam:
Lower Granite Dam. Snake River. River Mile 107.5
Constructed:
1975 (units 1-3); additional units 4-6 completed in 1978
Owner:
U.S. Army Corps of Engineers, Walla Walla District
Normal Operating Pool1:
733.0-738.0 feet
Maximum Pool1:
746.5 feet
Powerhouse Capacity:
Nameplate capacity: 6 @ 135 MW, 810 MW total
Overload capacity: 6 @ 155.3 MW, 932 MW total
Hydraulic capacity: 130 kcfs
Spillway:
512 feet, 8 gates

1 From USACE Walla Walla District, Digital Project Notebook Structural Details Map.

Additional Information

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

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