A 20-acre wildfire was burning in Diamond Fork Canyon about 5 miles north of Spanish Fork Canyon.
The Wignall Fire began about 2:30 p.m. Tuesday, said U.S. Forest Service spokeswoman Loyal Clark. The cause had not yet been determined but lightning was reported in the area at the time the fire started.
One firefighter injured her knee climbing over the rough terrain, Clark said.
Rain fell on the fire Tuesday night; it was not threatening any structures. Crews expected to contain the fire by 2 p.m. Wednesday.
Meanwhile, a fire in a Salt Lake City municipal mulch storage pit reignited Tuesday night, a day after it first broke out.
The green waste storage pit likely had been smoldering Tuesday at 1790 W. Indiana Ave. (850 South) since a fire there was put out Monday night, said Salt Lake City fire spokesman Jasen Asay. As the mulch rekindled in the 200-by-300-foot pit, the water may have dried in the heat. Crews extinguished the fire about 9:30 p.m.
The fire was deemed to have been caused naturally Â probably by lightning strikes reported in the area Monday night, Asay said.
An unrelated brush fire was burning about 6:45 p.m. along Interstate 215 West, southbound, near State Road 201. It was put out quickly, dispatchers confirmed.