Hebgen Dam, Embankment dam in Gallatin County, Montana.
The concrete-core earthen dam spans 721 feet in length and rises 85 feet high on the Madison River, creating the expansive Hebgen Lake.
Montana Power Company constructed the dam in 1914, and ownership transferred to PPL Corporation in 1997 before NorthWestern Corporation acquired it in 2014.
The dam forms Hebgen Lake, which draws visitors for fishing, boating, and water sports throughout the recreational seasons.
The structure regulates water flow for downstream reservoirs and hydroelectric power plants, contributing to Montana's electrical supply through NorthWestern Energy's network.
During the 1959 Hebgen Lake earthquake, water surged over the dam's crest four times, yet the structure withstood the magnitude 7.5 event.
Location: Gallatin County
GPS coordinates: 44.86360,-111.33600
Latest update: March 16, 2025 21:11
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