Boulder Valley Flooding History

An interesting set of pages on floods in the Boulder, Colorado area, last updated in 2005:

Due to its location near the mouth of numerous canyons, the Boulder area is a major flash flood risk. Following are descriptions compiled by Elizabeth Black of some of the flash floods that have occurred in the region beginning with the flood of 1894. Such floods– and many larger– have happened before the area was developed…. and will sooner or later happen again.

  • 1894 (100 Year Flood– over 10,000 cubic feet per second on Boulder Creek)
  • 1896 (Damage around the city of Boulder)]
  • 1896 (Storm and damage around Marshall and Coal Creek drainage)
  • 1906 (Flood down Sunshine Canyon)
  • 1909 (Two Die in Two Mile Creek)
  • 1916 (Four Mile Canyon Creek flooding)
  • 1921 (Coal Creek)
  • 1929 (Cloudburst causes flooding)
  • 1938 (Eldorado Springs and South Boulder Creek flooding)
  • 1941 (Two Mile Creek)
  • 1950 (Four Mile Canyon Creek)
  • 1951 (Four Mile Canyon Creek)
  • 1955 (Two Mile Creek and Four Mile Canyon Creek)
  • 1969 (Two Mile Creek and Bear Creek flooding)

There is also a list of flood events, and a map of the at-risk areas of the town.

Boulder High Hazard Zone
Boulder High Hazard Zone

Anybody interested to know a list of the fools who built in the middle of the HHZ?

This area includes City of Boulder facilities, University of Colorado married student housing, many residences, businesses and Boulder High School.