Gibson Dam, Concrete arch dam in Teton County, Montana.
Gibson Dam extends 960 feet across the Sun River, featuring a height of 199 feet and a base thickness of 115 feet that narrows to 15 feet at the crest.
The United States Bureau of Reclamation constructed Gibson Dam between 1926 and 1929, marking the first American dam analyzed using the trial-load mathematical method.
The Sun River area near Gibson Dam holds connections to the Lewis and Clark expedition, who documented the region's natural features during their 1805 journey.
Gibson Reservoir stores 96,477 acre-feet of water from spring snowmelt, providing irrigation for 91,000 acres of farmland throughout the Sun River Valley.
Engineers created an exact scale model of Gibson Dam before construction to test its structural performance through simulated flood conditions.
Location: Teton County
GPS coordinates: 47.60330,-112.76100
Latest update: March 24, 2025 10:18
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