Wanapum Dam, Hydroelectric power station in Grant County, United States
The Wanapum Dam stretches 8,637 feet across the Columbia River, generating 1,221 megawatts of electricity through ten turbine units.
Construction of the dam started in 1959, and by 1963 the facility began producing power without requiring governmental funds or tax appropriations.
The Native American Wanapum tribe maintains connections to their ancestral lands near the dam, with a settlement established on the western bank.
The Grant County Public Utility District operates a visitor center featuring educational displays and a theater presenting information about hydroelectric power generation.
In 2014, engineers discovered a two-inch crack in the spillway, leading to an 11-week inspection that revealed a mathematical error in the original design.
Location: Grant County
Inception: 1959
Elevation above the sea: 174 m
Length: 2,632 m
GPS coordinates: 46.87520,-119.97100
Latest update: May 14, 2025 12:02
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