Interstate 115

I-115
Route information
Auxiliary route of I-15
Length	1.194 mi (1.922 km)
Existed	1971–present
NHS	Entire route
Major junctions
West end	I-15 / I-90 in Butte
East end	I-15 Bus. / I-90 Bus. in Butte
Location
Country	United States
State	Montana
Counties	Silver Bow
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Montana Highway System Interstate US State Secondary
← I-94 MT 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.