Crews on the Coconino National Forest began ignitions on two prescribed burns southeast of Flagstaff Thursday morning.
The work on 1,100 acres between Upper Lake Mary and Mormon Lake produced a large smoke plume visible from Flagstaff and elsewhere in the region. Crews also started ignitions on more than 200 acres near Stoneman Lake.
Officials say the burns are part of a series of treatment projects in the area, which will continue into next week.
Elsewhere, crews planned to burn more than 6,000 acres north of Bellemont this week and 500 acres near Happy Jack in the coming days.
Smoke will continue to be visible throughout the region and possibly impact Highway 180, Lake Mary Road, parts of Interstate 17 and other areas.
Multiple national forests and fire agencies have taken advantage of recent weather conditions to conduct prescribed burns throughout northern and central Arizona.