colorado flooding
© Cliff Grassmick APRailroad tracks at 9th Street, East of Airport Road, continue to be flooded in Longmont, Colo, on Sept. 14, 2013.
As many as six people are reported dead after historic flooding in Colorado.

At least 482 people remained unaccounted for in Larimer County, Colo., the county's sheriff Twitter feed announced Sunday morning. In Boulder County, there were 431 entries on the county's unaccounted-for list at 9 a.m., local time, but they were reduced to 212 entries by 3 p.m., representing 326 people, Boulder County Sheriff Joe Pelle said.

At least one person was killed in a collapsed home due to the flooding. Another life was taken on the 200 block of Linden in Boulder, Boulder Emergency Management officials reported. A third person was found dead in Fountain Creek, Colorado Springs police said. The fourth person died in Boulder, authorities told The Associated Press.

Two people are presumed dead after their houses were destroyed by flood waters in Larimer County, the sheriff's office said.

Rains continued to exacerbate problems in the region. Colorado Springs firefighters conducted water rescues near the Air Force Academy early Sunday afternoon.

Officials said the focus continued on search and rescue operations, which are challenging because numerous mountain roads are flooded, damaged and impassable.

Weather also grounded a fleet of sixteen helicopters on Sunday for use in Larimer County, the sheriff's office said.

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Parked vehicles sit partially submerged near Greeley, Colorado, on Saturday, September 14. Flooding in Colorado has washed away roads and bridges and flooded homes. Authorities warned more rain was on the way, threatening more flooding. At least four people have been killed and hundreds are unaccounted for, officials say.
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Highway 7 is completely blown out from the South St. Vrain River as a torrent of raging water rips through it about 12 miles west of Lyons on September 12.
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Three vehicles crashed into a creek after the road washed out from beneath them in Broomfield, Colorado, on September 12. Three people were rescued.