A motorist's discarded cigarette is being blamed for a wildfire in Daniels Canyon east of Heber Tuesday.
Sheriff's deputies escorted cars past several roadside hot spots Tuesday. The blaze had burned about 450 acres by Wednesday morning.Flames were first spotted about 3 p.m. about seven miles east of Heber, according to fire information officer Loyal Clark.
"The fire started on the side of Highway 40, so we've determined it was human-caused," said Clark.
Firefighters spent Tuesday bulldozing breaks on the north side of the blaze, while hand crews attacked flames from the west.
Helicopters also made several retardant drops, said Clark.
Some 75 people were fighting the fire with more expected to arrive Wednesday. Many of the firefighters were diverted from the Vivian Park Complex fires near Provo. That group of blazes was contained early Tuesday.
Officials were reluctant to predict a containment date because strong winds were expected Wednesday.
Meanwhile, crews spent Tuesday mopping up hot spots on the 124,000-acre Leamington Complex and the 15,000-acre Adelaide Complex in central Utah.
A new wildfire broke at the border of Tooele and Juab counties Tuesday evening and consumed about 1,000 acres of thick pinyon and juniper before being contained Wednesday.
The Boulter fire was located 12 miles southeast of Vernon and west of Eureka. Eight fire engines, one bulldozer and 30 firefighters worked on the fire overnight.
At one time, the fire shot up 50- to 60-foot flames, said a Salt Lake Interagency Fire Center spokesman.
Highway 36, which crosses the the area, was temporarily closed Tuesday. No injuries were reported and no structures were threatened.
Investigators don't know what sparked the blaze.