Larimer County spokesman John Schulz said that there are thousands of people in the county stranded and waiting for help.
More than 1,000 stranded residents have been evacuated from flooded areas by nightfall Saturday, according to the authorities.
The National Weather Service predicted more heavy rain all day on Sunday in northeastern Colorado.
The flooding is historic, with floodwaters from five days of heavy rain rushing down from mountain cliffs and canyons into the flat foothills and plains.
According to the report, Colorado Governor John Hickenlooper has declared a disaster emergency for 14 counties, and sanctioned six million dollars for flood response and recovery.
The floods are considered to be the worst in the state since 1976, when nearly 150 people died in Larimer County in a flash flood along the Big Thompson Canyon, the report added.
--ANI (Posted on 15-09-2013)