BOISE, ID-- Cooler weather helped firefighters contain the Pioneer Fire near Idaho City.
Over 600 firefighters continue to battle the fire, which has grown to 3,528 acres and is currently 29 percent contained.
A U.S. Forest Service press release says lighter winds and lower temperatures offered crews better access to the fire's perimeter to create new lines and fortify existing ones.
Officials expect the favorable conditions to continue throughout the day.
Authorities expanded the closure area around the fire Saturday due to concern for public safety.
The fire started Monday and has over 600 fire personnel working to contain it.
Firefighters are trying to protect the Elk Creek Watershed, the water source for Idaho City.
While the Mile Marker 14 Fire near the Lucky Peak Dam is 90 percent contained. Idaho State Highway 21 is currently open to through traffic.