Interstate 115

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I-115 marker

I-115

Route information
Auxiliary route of I-15
Length1.194 mi (1.922 km)
Existed1971–present
Major junctions
West end I-15 / I-90 in Butte
East end I-15 Bus. / I-90 Bus. in Butte
Location
CountryUnited States
StateMontana
CountiesSilver Bow
Highway system
I-94MT 117

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.