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Fire crews Monday continued to battle two wildfires in northern Utah.

Campgrounds and trails in Diamond Fork in Utah County remained closed Monday as the Red Ledges fire grew eight-fold in 24 hours.

The blaze had burned 2,400 acres on Red Mountain by Monday afternoon and was at zero percent containment. It started Sunday and forced the evacuation of people camping and hiking in the ares.

The fire is suspected to be human-caused, possibly by someone using a chain saw, officials said.

Meanwhile, crews were getting a handle on the Whiskey fire, which was burning about 5 miles southeast of Heber City in the Whiskey Springs area near Daniels Canyon. The fire had burned about 272 acres by Monday morning and did not grow during the day. As of nightfall, it was 30 percent contained, said fire spokesman Jason Curry.

"If everything goes well, we'll only be there or another day or two," Curry said.

Officials said that blaze was sparked about 1:30 p.m. Sunday on private property by someone who was shooting at a metal target.

No structures were threatened, but the passing lane on U.S. Highway 40 was closed Monday.

Also Monday, fire officials said Jordanelle Reservoir was reopened to water craft. It had been closed to all water traffic Sunday as crews battled a nearby wildfire.