The Cooper Fire on the North Kaibab Ranger District has continued to spread naturally and is now at 50 acres, the U.S. Forest Service said Saturday.
Progress has been made in eliminating forest ground litter within the existing Jacob Ryan Vegetation Management Project.
"The Cooper Fire is doing what fires have done here for thousands of years in the natural ecosystem," said District Ranger Randall Walker. "Today, our protection goals also include forest visitors, wildlife habitat, personnel, and cultural resources."
The fire will be allowed to spread naturally under close supervision from fire crews. Personnel may ignite fuels to reduce the chance of unwanted fire spread or behavior, the U.S. Forest Service said.
The fire is being managed by an incident commander, four wildland fire engines, a 10-person fire crew and several pieces of heavy equipment.
The lightning-sparked Cooper Fire started July 15.
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