The Mineral County sheriff’s office issued more evacuation orders Thursday afternoon as temperatures rose and the humidity decreased on the West Mullan fire burning north of Superior.
Fire officials say at least 100 residences have been evacuated since the fire started on Sunday.
Strong winds Wednesday afternoon helped push the fire from 1,800 acres to an estimated 3,650 acres, or 5.7 square miles by Thursday.
No traffic is being allowed north of the Clark Fork River in Superior.
Fire information officer Greg DiNitto says the northeastern part of the fire had burned very near the Bonneville Power Administration power line, but reportedly had not crossed it.
No structures have been lost.
The American Red Cross set up an emergency evacuation center at Superior Elementary School.