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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 ]
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 .
US 287 turns north-northwest and follows the Madison River for 40 miles (64 km) to Ennis, where it intersects MT 287, and continues north for 16 miles (26 km) to Norris, where it intersects MT 84. It continues for 19 miles (31 km) to MT 2 , just north of Sappington , where it turns east and the two routes share a ten-mile (16 km) concurrency.
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 ...
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 ).
Highway 84 (MT 84) is a 28.904-mile-long (46.516 km) east–west state highway in the U.S. State of Montana. MT 84's western terminus is at U.S. Route 287 (US 287) in the small community of Norris and the eastern terminus is at US 191 and MT 85 at Four Corners .
Norris is in northeastern Madison County, 16 miles (26 km) north of Ennis and 31 miles (50 km) south of Three Forks via US-287, and 36 miles (58 km) west of Bozeman via MT-84. The location is a hilly, relatively arid area used for farming and ranching; the Tobacco Root Mountains form a visual backdrop to the west.
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]