The highway begins at an intersection with MT 80 north of the hamlet of  Arrow Creek. The highway extends eastward from this point for approximately , ending at an intersection with U.S. Route 191 (US 191) at the post office of Brooks.
The road starts at an intersection with MT 80 north of the hamlet of  Arrow Creek. The highway then extends eastward from this point for approximately , ending at a junction with U.S. Route 191 (US 191) at the post office of Brooks.