Colorado fire near Pikes Peak forces 11,000 from homes DENVER (Reuters) - A fast-growing wildfire that blew up overnight in Colorado has forced 11,000 people from their homes and was threatening popular summer camping grounds beneath Pikes Peak, billed as the most visited mountain in North America. Live summit video from the 14,115-foot (4,302-metre) peak on Sunday showed plumes of dark smoke billowing in the air, and a cog railway that ferries tourists up the side of the famous mountain was shut down because of the wildfires. The blaze in the Pike National Forest, known as the Waldo Canyon Fire, has consumed about 2,500 acres since Saturday and triggered evacuation orders for 11,000 people from Colorado Springs and nearby towns, fire officials said. "This is a very, very volatile situation," said emergency worker Rob Deyerberg at the fire joint information center. The blaze was just one of 20 uncontrolled fires raging in U.S. states on Sunday, mostly in the West, stoked by wind and triple digit temperatures in some areas. A fresh blaze in neighboring Utah forced an estimated 2,500 people from their homes in that state, officials said. Of those evacuated in Colorado, about 6,200 people were cleared from Manitou Springs, often used as a base for travel to Pikes Peak, the inspiration for the patriotic song "America the Beautiful," fire department spokesman Dave Hunting said. Authorities also ordered residents to leave Green Mountain Falls, Chipita Park and Cascade, according to the fire incident command. No buildings had been lost to the Waldo Canyon Fire as of Sunday morning, but the flames could threaten houses if the wind shifts, Deyerberg said. El Paso County spokesman Dave Rose said the fire was burning just two miles from the base of Pikes Peak. Flames were also visible in a heavily wooded neighborhood of upscale homes just south of the Garden of the Gods, a park in Colorado Springs that is popular with rock climbers. The Waldo Canyon blaze came as firefighting resources were stretched by the monster High Park blaze west of Fort Collins, which has destroyed 200 homes since it was ignited two weeks ago. Another Colorado fire charred 21 homes on Saturday. The High Park Fire - the second-largest on record in the state and its most destructive - has so far consumed 82,114 acres in steep canyons. Sparked by lightning, it is blamed for the death of a 62-year-old grandmother in her mountain cabin. "This fire continues to be persistent and find new areas that it can burn," incident commander Bill Hahnenberg said. In Utah, a fire that erupted on Saturday evening pushed thousands of people from their homes in the rural communities of Fountain Green and Indianola on Sunday, and forced a 15-mile (24-km) closure of state highway 89. Fueled by gusty winds the more than 10,000-acre (4,000- hectare) Wood Hollow fire was ballooning rapidly since it started in the foothills near Fountain Green, about 100 miles south of Salt Lake City, Interagency Fire Center spokesman Don Carpenter said. An exact cause of the fire was under investigation, although Carpenter said it was human-caused. Evacuations were ordered in three small towns, including of 1,000 people from the town of Fountain Green and 1,500 from Indianola, as well as a number of rural subdivisions, officials said. The fire has burned up over a mountain ridge through grass, sage, pinion juniper and alpine firs, and by midday was burning down north-facing slopes into a small valley, Carpenter said. At least one structure was destroyed. "Everything is so dry and the temperatures are so high, it doesn't take much to have it go," he said, adding that about 64 firefighters were fighting the fire, with additional crews on the way. A PV-2 air tanker was providing air support. Further north, crews were still battling the Dump fire, 35 miles south of Salt Lake City. It was 40 percent contained on Sunday, U.S. Forest Service fire information officer Kim Osborn said. The 6,023-acre fire was started Thursday by target shooters and had earlier forced the evacuation of nearly 600 homes. Evacuation orders there were lifted on Saturday after keeping residents away about 30 hours. On Sunday, Osborn said the fire was burning on a ridge a good distance from any structures, but fire managers were closely watching for shifting afternoon winds. Additional reporting by Jennifer Dobner in Salt Lake City and David Bailey in Minneapolis; Writing by Cynthia Johnston; Editing by Eric Walsh