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Route information | ||||
Auxiliary route of I-15 | ||||
Length | 1.194 mi (1.922 km) | |||
Existed | 1971–present | |||
NHS | Entire route | |||
Major junctions | ||||
West end | ![]() ![]() | |||
East end | ![]() ![]() | |||
Location | ||||
Country | United States | |||
State | Montana | |||
Counties | Silver Bow | |||
Highway system | ||||
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Interstate 115 (I-115) is a 1.194-mile-long (1.922 km) auxiliary Interstate Highway in the U.S. state of Montana. It connects I-15/I-90 to Butte. The highway begins at an interchange with I-15/I-90 through generally rural areas in western Butte. It has an interchange with Excelsior Avenue before ending. The entire route was upgraded to interstate standards during the 1960s, and was further upgraded in 2005.
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