Sept 12 (Reuters) - Flash flooding in Boulder, Colorado, has left at least one person dead, prompted widespread evacuations and caused an unknown number of structural collapses, officials said on Thursday.
Up to 4 inches of additional rain (10 cm) is expected on Thursday, exacerbating already "extremely dangerous" conditions, said Andrew Barth, a Boulder County Office of Emergency Management spokesman.
"There is water everywhere," Barth said. "We've had several structural collapses, there's mud and muck and debris everywhere. Cars are stranded all over the place."
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. (1600 GMT)
The confirmed death was the result of a home collapse in nearby Jamestown, Colorado, and was located by emergency officials who have been going door to door in the canyons above the city, evacuating residents and ferrying the stranded to local shelters.
"We were evacuating the area up there and by the time we got to this house it was too late," Barth said. He said the victim has not yet been identified.
Barth said more than 400 students from the local campus of Colorado University were evacuated overnight and directed to local shelters, including the local YMCA.
"We're waiting for daylight to get a better assessment of the situation, but we're asking everybody who can to please stay where they are if possible," Barth said. "It only takes a little bit for a car to get swept away in these conditions." (Reporting by Chris Francescani; Editing by Scott Malone and Maureen Bavdek)