Floods Colorado Office of Emergency Management Flood Facts Floods are the most common and widespread of all natural hazards.
Some floods develop slowly, but flash floods can happen in just minutes.
Floodprone areas have been identified in 267 cities and towns and in all of the 63 counties in Colorado. Over 250,000 people are living in Colorado' s floodplains. There are estimated to be 65,000 homes and 15,000 commercial, industrial, and business structures in identified floodplains. There are likely many more structures located within unmapped flood hazard areas. Do not drive over a flooded road Abandon a stalled vehicle and immediately move to higher ground Flash floods Flash floods can move at incredible speeds.