In the early evening of July 31, 1976, a large stationary thunderstorm released as much as 7.5 inches of rainfall in about an hour (over 12 inches in a few hours) in the upper reaches of the Big Thompson River drainage. This large amount of rainfall in such a short period of time produced a flash flood that caught residents and tourists by surprise. The immense volume of water that churned down the narrow Big Thompson Canyon scoured the river channel and destroyed everything in its path, including 418 homes, 152 businesses, numerous bridges, paved and unpaved roads, power and telephone lines, and many other structures. The tragedy claimed the lives of 145 people. Scores of other people narrowly escaped with their lives. The Big Thompson flood ranks among the deadliest of Colorado’s recorded floods. It is one of several destructive floods in the
United States that has shown the necessity of conducting research to determine the causes and effects of floods.
For More information regarding the Big Thompson Flood and Flood Safety please see the links below: