Hebgen’s original outflow pipe was built in 1910. It flows west then north through the mountains of southwestern Montana to join the Jefferson and Gallatin rivers at Three Forks. Drag sliders to specify date range From:. Montana Power Company originally built the dam, PPL Corporation purchased it in 1997 and sold it to NorthWestern Corporation in 2014. Hebgen Lake Dam, built in 1914, has served a purpose beyond its initial function of controlling floodwaters, storing water for downstream users and generating electricity – it’s also acted as It is used to store runoff from a 905-square-mile drainage area at the headwaters of the Madison-Missouri river system and to regulate the flow of water into that system. Summary: Photo shows drawing of cross section and composition of Hebgen Dam. The Natural Resource Conservation Service’s (NRCS) Snotel sites above Hebgen are well above average at 115 percent, while the sites below Hebgen are at 89 percent. Montana Power Company originally built the dam, PPL Corporation purchased it in 1997 and sold it to NorthWestern Corporation in 2014. Right now, flows out of Hebgen Dam have been cut to 670 cfs. Butte, Mont. I'm going to include parts of a river report from the Madison River Fishing Company here so you can get some of the updates on the problems plaguing Hebgen Dam. Each loop contains approximately 20 campsites. The 1959 Hebgen Lake earthquake (also known as the 1959 Yellowstone earthquake) occurred on August 17 at 11:37 pm (MST) in southwestern Montana, United States.The earthquake measured 7.2 on the Moment magnitude scale, caused a huge landslide, resulted in over 28 fatalities and left US$11 million (equivalent to $96.48 million in 2019) in damage. – May 21, 2018 – NorthWestern Energy is planning to release water from Hebgen Dam with the goal of flushing fine sediments from Madison River gravel under the terms of its operating license with the U.S. Federal Energy Regulatory Commission (FERC).. Hebgen Dam, an 85-foot-tall, 721-foot-long earthfill dam, regulates flow into the Madison River system. The slide blocked the flow of the Madison … Butte, Mont. Hebgen Dam Repair Update Date: 11/19/2015. Bad News (9/19/2008) Hebgen Lake is an idyllic body of water, famous for its trout fishing. The inside was made of wood and it was encased in concrete. As a flow-control and storage reservoir, the 386,000-acre-foot volume of Hebgen Lake provides a benefit to the 11 downstream hydroelectric plants on the Madison and Missouri rivers in Montana. 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 is 85 feet tall and 721 feet long. To protect the outlet of Quake Lake from erosion, the Madison River flows will be maintained at about 3,500 cubic feet per second at the Kirby Ranch stream gage. It was 12 feet in diameter. Northwestern plans to begin with a flow regime of mixed surface and deep discharge, gradually progressing to all deep discharge. If Hebgen Dam were to fail catastrophically during a time of year when rivers were already running high, the city of Three Forks and much of the surrounding area, including a 4-mile stretch of Interstate 90, would be inundated by more than 11 feet of water within a day, according to emergency managers who attended a preparedness exercise in West Yellowstone this week. Hebgen Lake elevation is at 6,534.57 feet as of June 24th which is 0.30 feet from full pool. Hebgen Lake is a man-made lake, retained by an earth-fill dam. Hebgen Dam from Mapcarta, the free map. The dam is 85 feet tall and 721 feet long. (HNN 6/19/08) In the original event, flows from Hebgen Dam increased to 3,400 cubic feet per second from 850 cfs, dropping the level of the reservoir behind the dam by more than eight feet. Luckily, the dam did not fail and the waves eventually died off. 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