More than 200 firefighters are battling the blaze, which has grown to more than 500 acres, and more resources are en route, the Boise National Forest announced Wednesday.
The fire started Monday eight miles northeast of Idaho City. An area closure was issued Monday night to protect the public. The cause of the fire has not been determined.
The steep terrain and remote location is challenging for firefighters as they continue to work toward containing the fire, according to a national forest news release. Crews must hike in miles to work on the line, and four additional hotshot crews were requested.
"We've put all of our available resources on the fire and have more fire crews traveling from other states to assist us in responding to the fire," said Bobby Shindelar, fire and aviation staff officer for the Boise National Forest.
No structures are reportedly in danger. Smoke can be seen from Idaho City, Centerville and Pioneerville, but the fire is headed northeast away from these communities.
The areas closure begins at the Junction of Bear Run Road and Main Street in Idaho City, the Boise National Forest reports. Bear Run Road to Meadow Drive and the Duquette Pines Subdivision road are not included in the closure.