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Three dead as Colorado floods worsen, smashing rainfall records (photos)

Emergency personnel work to rescue a man trapped in his vehicle during a flooding of Rock Creek in Lafayette, Colorado September 12, 2013, in this photo courtesy of CBS4 Denver. REUTERS/CBS4 Denver/Handout via Reuters1 / 6
Water runs freely down Topaz Drive as heavy rains cause severe flooding in Boulder, Colorado September 12, 2013. REUTERS/Mark Leffingwell2 / 6
Tow crews work to assist stranded cars from South Boulder Road after heavy rains caused flooding in Boulder, Colorado September 12, 2013. REUTERS/Mark Leffingwell3 / 6
Hanna Hinseth walks through ankle deep water to get to her home to inspect the extent of damage after heavy rains caused severe flooding in Boulder, Colorado September 12, 2013. REUTERS/Mark Leffingwell4 / 6
A man (requested his name not be used) tries to untangle debris that have been washed down to his home after severe flooding in Boulder, Colorado September 12, 2013. REUTERS/Mark Leffingwell5 / 6
A section of Highway 72 is missing after a flash flood tore through Coal Creek near Golden, Colorado September 12, 2013. REUTERS/Rick Wilking6 / 6

(Reuters) - Flooding that killed at least three people in Colorado, toppling buildings and stranding drivers, worsened overnight as record rains pounded the state, forcing thousands more residents to flee to higher ground, officials said.

The unusual late-summer downpours drenched Colorado's biggest urban centers, stretching 130 miles along the eastern slopes of the Rockies from Fort Collins near the Wyoming border south through Boulder, Denver and Colorado Springs.

In Boulder, the rainfall record for September set in 1940 was shattered, officials said, unleashing surging floodwaters in Boulder Canyon above the city that triggered the evacuation of some 4,000 residents late on Thursday.

"There's so much water coming out of the canyon, it has to go somewhere, and unfortunately it's coming into the city," said Ashlee Herring, spokeswoman for the Boulder office of Emergency Management.

Boulder Creek, which runs through the heart of the city, became a raging torrent that burst its banks and flooded adjacent parking lots and streets as warning sirens wailed.

Other towns nestled along the Front Range of the Rockies north of Denver were also hard hit.

In Longmont about 14 miles northeast of Boulder, the St. Vrain River jumped its banks, cascading across main thoroughfares and making travel across the city impossible overnight.

"Our city is completely divided," by the floodwaters, assistant city manager Shawn Lewis told Reuters. Lewis said 7,000 households were under mandatory evacuation orders. The city opened two emergency shelters for displaced residents.

President Barack Obama approved a federal disaster assistance request, which will release funds to help with emergency protection, Governor John Hickenlooper's office said late on Thursday.

National Guard troops were dispatched with emergency supplies to the remote town of Lyons, north of Boulder, which was virtually cut off from surrounding areas when floodwaters washed out U.S. Route 36, county officials said.

A dozen major roads in northeastern Colorado remained shut with significant damage from flooding, mudslides, rockfalls and other debris, the Colorado Department of Transportation said late on Thursday.

Heavy summer rains are not unusual for Colorado, but the intensity and duration of the downpour that began on Monday night was unprecedented.

The National Weather Service said at least 12.3 inches (31 cms) of rain have fallen on Boulder since September 1, smashing a 63-year-old record of 5.5 inches (14 cms) for the month.

A flood watch was extended until 6 a.m. on Friday for the entire Front Range, the NWS said, and the rainfall is not expected to ease until later in the day.

One body was found in a collapsed building near Jamestown, an evacuated enclave north of Boulder.

A couple were swept away in floodwaters after stopping their car northwest of the city. The man's body was recovered but the woman was missing and feared dead, said Commander Heidi Prentup of the Boulder County Sheriff's Office.

The body of a third confirmed fatality, a man, was found by police on flood-watch patrols in Colorado Springs, about 100 miles to the south, officials said.

Nearly 150 people were killed near Boulder in 1976 by a flash flood along the Big Thompson Canyon.

(Editing by Tim Gaynor, John Stonestreet)

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