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At least three people have been reported dead, thousands of others forced from their homes in Boulder, Colo., due to heavy flooding. The National Weather Service says at least 31 centimetres of rain have fallen on the city since Sept. 1, 2013.

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An aerial view shows flood waters and a washed-out road adjacent a suburban neighborhood in Lyons, Colorado September 13, 2013. National Guard troops plucked stranded residents out of danger by helicopter and hauled them out of an inundated community in military trucks Friday, as the death toll from the worst floods to hit Colorado in decades rose to four with 80 people still unaccounted for.Reuters

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This aerial photo shows Highway 34 being destroyed toward Estes Park , Colo. as flooding continues to devastate the Colorado Front Range and thousands are forced to evacuate with an unconfirmed number of structures destroyed Friday, Sept. 13, 2013.The Associated Press

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Cattle find dry ground near Fort Collins, Colo., as flooding continues to devastate the Front Range and thousands are forced to evacuate with an unconfirmed number of structures destroyed Friday, Sept. 13, 2013.Colorado Heli-Ops, Dennis Pierce

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Jake Bennett drops a sand bag down to help funnel water down a street as heavy rains cause severe flooding in Boulder, Colorado September 12, 2013.Flash flooding caused by torrential downpours in Colorado has killed at least three people and forced hundreds to flee to higher ground as rising water caused buildings to collapse and stranded cars, officials said on Thursday.MARK LEFFINGWELL/Reuters

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Brother and sister Patrick Tinsley and Mary Kerns walk into Boulder, Colo., from their mountain community Magnolia, where road access is shut off by debris from days of record rain and flooding, at the base of Boulder Canyon, Colo., Friday, Sept. 13, 2013.Brennan Linsley/The Associated Press

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Officials investigate the scene of a road collapse at Highway 287 and Dillon at the Broomfield/Lafayette border, Colo., that sent three vehicles into the water after flash flooding on Thursday, Sept. 12, 2013. The National Weather Service has warned of an "extremely dangerous and life-threatening situation" throughout the region.Cliff Grassmick/The Associated Press

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Malia Clearwater shovels debris into a dike to funnel to funnel water down a street as heavy rains cause severe flooding in Boulder, Colorado September 12, 2013. Flash flooding caused by torrential downpours in Colorado has killed at least three people and forced hundreds to flee to higher ground as rising water caused buildings to collapse and stranded cars, officials said on Thursday.MARK LEFFINGWELL/Reuters

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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. The National Weather Service has issued a flash flood warning for central Boulder County that will remain in effect through at least 10 a.m. local time.HANDOUT/Reuters

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Trent Fallica of the City of Boulder Traffic Signal Department, checks on an electrical box next to a raging creek during the flood in North Boulder, Colo., on Thursday, Sept. 12, 2013. Heavy rains and scarring from recent wildfires sent walls of water crashing down mountainsides early Thursday in Colorado, cutting off mountain towns. Boulder County was hit hardest, but flooding was reported all along the Front Range, from Colorado Springs to north of Fort Collins.Paul Aiken/The Associated Press

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A home and car are stranded after a flash flood in Coal Creek destroyed the bridge near Golden, Colorado September 12, 2013. Flooding in Colorado left two people dead, prompted hundreds to be evacuated, caused building collapses and stranded cars, officials said.RICK WILKING/Reuters

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A geyser of flood water shoots out of a sewer on Canon Avenue next to the Cliff House in Manitou Springs, Colo. Thursday, Sept. 12, 2013 as storms continue to dump rain over the Waldo Canyon burn scar.Michael Ciaglo/The Associated Press

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A section of Highway 72 is missing after a flash flood tore through Coal Creek near Golden, Colorado September 12, 2013. Flooding in Colorado left two people dead, prompted hundreds to be evacuated, caused building collapses and stranded cars, officials said.RICK WILKING/Reuters

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Emergency personnel work to rescue a man trapped in his vehicle during flooding of Rock Creek in Lafayette, Colorado September 12, 2013, in this photo courtesy of CBS4 Denver. The National Weather Service has issued a flash flood warning for central Boulder County that will remain in effect through at least 10 a.m. local time.HANDOUT/Reuters

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Emergency personnel work to rescue a man trapped in his vehicle during flooding of Rock Creek in Lafayette, Colorado September 12, 2013, in this photo courtesy of CBS4 Denver. The National Weather Service has issued a flash flood warning for central Boulder County that will remain in effect through at least 10 a.m. local time.HANDOUT/Reuters

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