Hebgen Dam
| Hebgen Dam | |
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The damaged Hebgen Dam in 1959
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 Location of Hebgen Dam in United States
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| Official name | Hebgen Dam |
| Location | Gallatin County, Montana |
| Coordinates | 44°51′49″N 111°20′08″W / 44.86361°N 111.33556°WCoordinates: 44°51′49″N 111°20′08″W / 44.86361°N 111.33556°W |
| Opening date | 1914 |
| Owner(s) | NorthWestern Corporation |
| Dam and spillways | |
| Type of dam | Concrete-core, earthen embankment |
| Impounds | Madison River |
| Height | 85 feet (26 m) |
| Length | 721 feet (220 m) |
| Spillway type | Chute, gate-controlled |
| Reservoir | |
| Creates | Hebgen Lake |
| Total capacity | 325,000 acre·ft (0.401 km3) |
| Catchment area | 905 square miles (2,340 km2) |
| Surface area | 21 square miles (54 km2) |
The Hebgen Dam is a concrete-core earthen embankment dam on the Madison River in the U.S. state of Montana. The dam is 85 feet tall and 721 feet long. The dam's purpose is to store and regulate water for other downstream reservoirs and hydroelectric power plants.Montana Power Company originally built the dam, PPL Corporation purchased it in 1997 and sold it to NorthWestern Corporation in 2014.
The dam was built in 1914 and created Hebgen Lake. After the 1959 Hebgen Lake earthquake, the dam was damaged but it was fixed several weeks later. On August 30, 2008, two of the dam's four hydraulic gates failed, releasing 3,400 cubic feet (96 m3) per second of water into the Madison River. The normal discharge of the dam is 900 cubic feet (25 m3) per second and the gate failure caused a 1-foot rise in the river.
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