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updated: 9/12/2013 9:33 PM

Colorado flooding cuts off mountain towns, kills 3

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  • Video: Colorado flooding

  • A car drives on a flooded road following overnight flash flooding in downtown Boulder, Colo., Thursday. The widespread high waters are keeping search and rescue teams from reaching stranded residents and motorists in Boulder and nearby mountain communities as heavy rains hammered northern Colorado.

      A car drives on a flooded road following overnight flash flooding in downtown Boulder, Colo., Thursday. The widespread high waters are keeping search and rescue teams from reaching stranded residents and motorists in Boulder and nearby mountain communities as heavy rains hammered northern Colorado.
    Associated Press

  • A city worker talks on his phone while surveying high water levels on Boulder Creek following overnight flash flooding in downtown Boulder, Colo., Thursday.

      A city worker talks on his phone while surveying high water levels on Boulder Creek following overnight flash flooding in downtown Boulder, Colo., Thursday.
    Associated Press

  • A police officer allows a special dive rescue team to pass on a closed road following overnight flash flooding in Boulder, Colo., Thursday. The widespread high waters are keeping search and rescue teams from reaching stranded residents and motorists in Boulder and nearby mountain communities as heavy rains hammered northern Colorado.

      A police officer allows a special dive rescue team to pass on a closed road following overnight flash flooding in Boulder, Colo., Thursday. The widespread high waters are keeping search and rescue teams from reaching stranded residents and motorists in Boulder and nearby mountain communities as heavy rains hammered northern Colorado.
    Associated Press

  • Officials investigate the scene of a road collapse at the Broomfield/Lafayette, Colo., border, that sent three vehicles into the water after flash flooding on Thursday.

      Officials investigate the scene of a road collapse at the Broomfield/Lafayette, Colo., border, that sent three vehicles into the water after flash flooding on Thursday.
    Associated Press

 
Associated Press

LYONS, Colo. -- Heavy rains sent walls of water crashing down mountainsides Thursday in Colorado, cutting off remote towns, forcing the state's largest university to close and leaving at least three people dead across a rugged landscape that included areas blackened by recent wildfires.

After a rainy week, up to 8 more inches fell in an area from the Wyoming border south to the foothills west of Denver. Flooding extended all along the Front Range mountains and into some cities, including Colorado Springs, Denver, Fort Collins, Greeley, Aurora and Boulder.

Numerous roads and highways were washed out or made impassable by floods. Floodwaters poured into homes, and at least a few buildings collapsed in the torrent.

Boulder County appeared to be hardest hit. Sheriff Joe Pelle said the town of Lyons was completely cut off because of flooded roads, and residents were huddling together on higher ground. Although everyone was believed to be safe, the deluge was expected to continue into today.

"It is not an ordinary disaster," Pelle said. "All the preparation in the world ... it can't put people up those canyons while these walls of water are coming down."

By mid-afternoon, some high-clearance vehicles were on their way to the town, where the Red Cross said about 200 people sought shelter in an elementary school.

To the north, residents along the Big Thompson Canyon in Larimer County, scene of the deadliest flash flood in state history, were also evacuated. The Big Thompson River flooded in 1976 after about a foot of rain fell in just four hours, killing 144 people.

Some of the flooding was exacerbated by wildfire "burn scars" that have spawned flash floods all summer in the mountains. That was particularly true in an area scarred by fire in 2010 near the tiny community of Jamestown and another near Colorado Springs' Waldo Canyon that was hit in 2012.

Rain is normally soaked up by a sponge-like layer of pine needles and twigs on the forest floor. But wildfires incinerate that layer and leave a residue in the top layer of soil that sheds water. A relatively light rain can rush down charred hillsides into streambeds, picking up dirt, ash, rocks and tree limbs along the way. Narrow canyons aggravate the threat.

At the University of Colorado, about 400 students in a dorm were evacuated, and administrators canceled classes at least through today. About a quarter of the school's buildings have water damage.

One person was killed when a structure collapsed in the tiny town of Jamestown northwest of Boulder. Another person drowned in northern Boulder as he was trying to help a woman who was swept away in a torrent of water, authorities said. Boulder County sheriff's Cmdr. Heidi Prentup said the woman is still missing.

To the south, Colorado Springs police conducting flood patrols found the body of 54-year-old Danny Davis in Fountain Creek on the west side of the city.

Weather service meteorologist Bob Kleyla said a 20-foot wall of water was reported in Left Hand Canyon north of Boulder, and a firefighter radioed he was trapped in a tree. He said rescuers trying to get to him were initially blocked by debris.

"We did access him. They put him onto a sled and were able to take him across the creek, so he is getting treatment at this point," Prentup said.

The creek is usually "just a trickle," said nearby resident Carm Say. "You can walk across it and have fun. Now, as you can see, it's hitting houses."

At least one earthen dam gave way southeast of Estes Park, the gateway to Rocky Mountain National Park. Water levels could rise downstream as authorities release more water to ease pressure on dams. With debris piling up near bridges, downstream farming areas including Fort Lupton, Dacono and Plateville were also at risk.

In rural Morgan County, authorities urged ranchers to move cattle to higher ground as the mountain rains emptied onto the plains.

Rain showers and thunderstorms were expected through the night, with some storms capable of dumping an inch of water in 30 minutes, the weather service warned.

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