Garrison Dam, Powerhouse, 597 Garrison Dam Road, Riverdale, McLean County, ND

Significance: The powerhouse was built to generate electrical power via hydroelectric turbines and generators, using the water impounded in Lake Sakakwea as its energy source. The electricity feeds into the Western American Power Administration grid. The powerhouse serves in its original function as intended by policies set forth in the Pick-Sloan Plan for improvements on the Missouri River, enacted by a 1944 Congressional flood-control bill.
Unprocessed Field note material exists for this structure: N1588, N1589
Survey number: HAER ND-15-A
Building/structure dates: 1953-1956 Initial Construction
Building/structure dates: 2000-2005 Subsequent Work
Building/structure dates: 2010 Subsequent Work
Building/structure dates: 1991 Subsequent Work
Building/structure dates: 1983 Subsequent Work