Lower Monumental Dam, Hydroelectric power station and lock in Walla Walla County, United States.
The Lower Monumental Dam extends 3,791 feet across the Snake River, featuring eight spillway gates and a navigation lock for vessel passage.
The U.S. Army Corps of Engineers initiated construction in 1961, completing three generators by 1969 and adding three more units by 1981.
The dam forms Lake Herbert G. West, which extends 28 miles eastward and provides opportunities for fishing, boating, and wildlife observation.
The power station generates 810 megawatts through six units, supporting the electrical needs of communities throughout the Pacific Northwest region.
The navigation lock system features a single lift mechanism with dimensions of 86 feet in width and 666 feet in length.
Location: Walla Walla County
Inception: 1961
Length: 1,155 m
GPS coordinates: 46.56240,-118.53700
Latest update: March 12, 2025 14:39
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