Interstate 115
Interstate 115 (I-115) is a  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.