Fire managers report that the Cinnabar Fire burning near Stevensville continues to be not contained.
The fire became more active Saturday with a cold front causing the fire to spread now totaling 1,955 acres.
Crews on the fire constructed and improved indirect suppression lines on the west and south ends of the fire.
Due to the remote location of the fire, an Unmanned Aircraft System (UAS) was utilized to collect data over the fire area including more accurate mapping and calculating the acreage.
Firefighters will continue with suppression efforts on the Cinnabar Fire.
To the north and east of the fire, crews are assessing areas for access and structure protection.
The UAS will be used Sunday to help fire managers assess terrain, fire activity and access routes in more remote areas.
The fire continues to burn within the Welcome Creek Wilderness boundary, on the Lolo National Forest in Granite County.
The closure includes the entire Welcome Creek Wilderness, and additional roads and trails adjacent to the Wilderness for public and firefighter safety.
The Ambrose Rock Creek Road #428 is now closed.
There are currently 213 people battling the Cinnabar Fire which was sparked by lightning on Aug. 19.