(CNN) -- More than half a foot of rain deluged Boulder County, Colorado, overnight, setting off rock slides, putting dams at risk and killing at least two people.
One person died after being trapped in a collapsed building, Boulder County spokeswoman Gabbie Boerkircher said. The circumstances surrounding the other death weren't clear early Thursday, but the Colorado Springs Fire Department said on Twitter that the body had been recovered by a "heavy rescue team."
Numerous buildings collapsed as a result of the enormous rainfall -- around 7 inches in Boulder, according to CNN meteorologists.
The exact number of homes damaged was unknown as a rock slide in the area was hampering rescue operations.
In Lyons, Colorado, water was flowing over the tops of five dams, Boerkircher said. The dams hadn't broken, but officials were monitoring them very closely, she said.
Minor damage was also reported at the University of Colorado in Boulder, where more than 400 graduate students and research faculty members had to be moved from family housing units next to the flooding Boulder Creek, a school spokesman said.
The school also had to move 13 undergraduates due to minor flooding. No injuries had been reported, school officials said.
The National Weather Service had issued a flash flood warning in the area for early Thursday.
"This is a life threatening situation," The National Weather Service said. "Heavy rainfall will cause extensive and severe flooding of creeks, streams, roads and culverts."