The Pioneer Fire burning north of Idaho City expanded to about 3,500 acres by Sunday afternoon, but firefighters had the blaze 29 percent contained thanks to weather conditions.
Idaho Highway 21 and the Banks/Lowman Road are still open, but smoke could be impacting the area around Lowman and Garden Valley, according to a Boise National Forest release.
Lighter winds and lower temperatures offered crews better access to the fire’s perimeter to create new lines and fortify existing ones, according to the release. 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.
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The fire, which began Monday, currently has more than 600 fire personnel working to contain it.
Firefighters are trying to protect the Elk Creek Watershed, the water source for Idaho City.