Business Loop I-90 - Deer Lodge
Business Loop I-90 serves Deer Lodge along a 3.5 mile route between Exits 184 and 187. The loop doubles as unsigned Montana Secondary Highway 275 along Main Street, which is also old U.S. 10. Deer Lodge provides several lodging options for travelers and is a tourist destination with points of interest including the Old Prison Museums, Montana Auto Museum and Frontier Montana Museum.
Updated August 1, 2026