Lower Monumental Dam
|Lower Monumental Dam|
View from the southwest
|Location||Franklin and Walla Walla counties, Washington, U.S.|
|Construction began||June 1961|
|Operator(s)||U.S. Army Corps of Engineers|
|Dam and spillways|
|Type of dam||Concrete gravity,|
|Height||100 feet (30 m)|
|Length||3,791 feet (1,155 m)|
|Spillway type||Service, gate-controlled|
|Creates||Lake Herbert G. West|
|Total capacity||432,000 acre⋅ft (0.53 km3)|
|Surface area||6,590 acres (26.7 km2)|
|Normal elevation||540 ft (165 m)|
|Turbines||6 x 135-153 MW|
|Installed capacity||810 MW|
932 MW (max)
Lower Monumental Lock and Dam is a hydroelectric, concrete, run-of-the-river dam in the northwest United States. Located on the Snake River, it bridges Franklin and Walla Walla counties in southeast Washington. It is six miles (10 km) south of Kahlotus and 43 miles (70 km) north of Walla Walla.
Construction began in June 1961, and the main structure and three generators were completed in 1969, with an additional three generators finished in 1981. Generating capacity is 810 megawatts, with an overload capacity of 932 MW. The spillway has eight gates and is 572 feet (174 m) in length.
Lower Monumental Dam is part of the Columbia River Basin system of dams.
Behind the dam, Lake Herbert G. West is the reservoir; it extends 28 miles (45 km) east to the base of Little Goose Dam. Lake Sacajawea, formed from Ice Harbor Dam, runs 22 miles (35 km) southwest, downstream from the base of the dam.
- Navigation lock
- Width: 86 ft (26 m)
- Length: 666 ft (203 m)
- "The Four Lower Snake River Dams". Bluefish.org. Retrieved 17 July 2010.
- "Lower Monumental Dam". Washington.edu. Retrieved 17 July 2010.[dead link]
- "Lower Monumental Dam". Lewiston Morning Tribune. (Idaho). (photo). March 19, 1964. p. 13.
- "The Columbia River System Inside Story" (PDF). BPA.gov. pp. 14–15. Retrieved 17 July 2010.
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