The Cyr Gulch Fire burning south of Frenchtown is burning 47.8 acres.
The fire was reported Wednesday afternoon. It's burning in the Deep Creek area, on the west side of the Clark Fork River, about five miles south of Frenchtown.
Fire officials list containment of the blaze at 80 percent lined as of Thursday evening.
A second fire spotted in the area, the Hagerty Fire, started after lightning struck a tree. That fire was doused quickly after it burned about a quarter acre.
Multiple engines, heavy equipment and a Deer Lodge fire crew are all working the Cyr Gulch fire.
Officials ask residents to stay away from the Deep Creek area as crews continue to fight the fire.
They also remind folks that campfires are still allowed at this time, but should be cold to the touch before being left.
Open burning of debris is closed in Missoula County. There are no other restrictions currently in place, but fire officials are urging caution.