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Montana Power Company acquired the dam in 1912 as part of a merger, PPL Corporation purchased it in 1997 and sold it to NorthWestern Corporation in 2014. The reservoir it creates, Ennis Lake , is 2.6 miles (4.2 km) long and has a maximum storage capacity of 42,053 acre-foot (51,872,000 m 3 ). [ 2 ]
Following is a list of dams and reservoirs in Montana. All major dams are linked below. The National Inventory of Dams defines any "major dam" as being 50 feet (15 m) tall with a storage capacity of at least 5,000 acre-feet (6,200,000 m 3 ), or of any height with a storage capacity of 25,000 acre-feet (31,000,000 m 3 ).
Ennis is a town in Madison County, Montana, United States, in the southwestern part of the state. The population was 917 at the 2020 census , [ 5 ] up from 838 in 2010 . U.S. Route 287 runs through town, following the Madison River as it descends from the town of West Yellowstone .
In its middle reaches in Madison County, Montana, the Madison Dam forms Ennis Lake and provides hydroelectric power. In 1959, the 1959 Hebgen Lake earthquake formed Quake Lake just downstream from Hebgen Dam. Downstream from Ennis, the Madison flows through Bear Trap Canyon, known for its class IV-V whitewater. [4]
Hebgen Dam is a concrete-core earthen embankment dam in the western United States, located on the Madison River in southwestern Montana. The dam is 85 feet (26 m) tall and 721 feet (220 m) in length; its purpose is to store and regulate water for other downstream reservoirs and hydroelectric power plants . [ 2 ]
Willow Creek Dam (Montana) Y. Yellowtail Dam This page was last edited on 24 December 2023, at 10:26 (UTC). Text is available under the Creative Commons ...
In 1961, MT 287 was rerouted and replaced MT 34 from Ennis to Twin Bridges, ran concurrently with MT 41 to north of Silver Star, and replaced S-401 north to US 10 at Whitehall. MT 287 continued east with US 10 to rejoin its previous route west of Three Forks. The portion of the highway between Ennis and the US 10 junction became MT 287A. [6] [7]
Montana Highway 287 (MT 287) is a state highway in the U.S. state of Montana. The highway runs 42.822 miles (68.915 km) from MT 41 in Twin Bridges east to U.S. Route 287 (US 287) in Ennis. MT 287 is the primary east–west highway of Madison County. The highway connects the county's four towns, including Sheridan and the county seat of Virginia ...