DENVER (AP) — National Guard troops have resumed truck convoys to rescue people stranded by floodwaters in the cut-off Colorado community of Lyons.
An estimated 2,500 residents are being evacuated in an operation that began yesterday.
Helicopters are being used to airlift 295 residents of another isolated town, Jamestown.
The National Guard has also been airdropping food, water and other supplies to people stranded in narrow canyons in the Rocky Mountain foothills.
Evacuations are voluntary, but those who choose to stay with their homes could face weeks without power, water, sewer or cellphone service.
Days of heavy rain sent water rushing from the mountains into communities below, inundating farms and destroyed roads and bridges, turning neighborhoods and towns into islands.
The flooding affects parts of a 4,500-square-mile area, almost the size of Connecticut.
At least four deaths have been blamed on the flooding. Officials in hard-hit Boulder County say more than 170 people are unaccounted for. But they say that just means they haven't been heard from, not that they're actually missing.