The Copper King Fire burning near Thompson Falls in northwest Montana has now grown to 700 acres.
The fire was detected on Sunday, July 31st; the cause of the fire is not yet known.
There is no containment of the fire as of Monday afternoon.
Montana Highway 200 remains open in the area and authorities say no evacuations have been ordered, and there are no immediate threats to buildings or private property.
US Forest Service Road No. 56 on the west side of Thompson River also remains open, but US Forest Service Road No. 9991 -- along the east side of Thompson River is closed -- as is road No. 5587 to the east of the fire.
USFS trails #345, #368, #370, #372, #445 and #1268 have also been closed until further notice. Motorists traveling through the fire area are being asked to not stop on the roadways and congest fire or civilian traffic.
Personnel on the Plains/Thompson Falls Ranger District, with help from other units, are managing the fire, but a Type 2 Incident Management Team will assume management of the fire beginning at 6 a.m. on Tuesday, according to Lolo National Forest officials.
A helicopter, several engines, and 33 firefighters were fighting the fire Monday morning, but more resources have been ordered.
Click here for more details on the InciWeb website.