The Pioneer Fire five miles west of Wise River was 75 percent contained as of Tuesday morning.
The size of the fire was estimated at 45 acres, and one fire engine crew was working it. The fire is burning in the Alder Creek area and along Highway 43.
The plan for Tuesday, according to Beaverhead-Deerlodge National Forest spokesperson Leona Roderick was to patrol the fire, put out hot spots, and strengthen fire lines.
Highway 43 is open, but Roderick urged that travelers along the road exercise caution because of firefighters and equipment in the area.