Event narrative (NOAA)
Heavy rain, ranging from 6 to 18 inches through the storm event, caused widespread flooding along the entire drainage systems of Boulder and St. Vrain Creeks. Three vehicles were partially submerged when floodwaters undercut Dillon Road near CO287, between Lafayette and Broomfield. When the road first collapsed, several people were able to get out of the water quickly, but three were trapped in their vehicles and had to be rescued. The three drivers were taken to local hospitals for treatment. Extensive flooding was reported in Longmont and forced several road closures. Floodwaters tipped over two storage tanks containing sulfuric acid at the Longmont Brewery. Several shelters were set up for evacuees. Numerous bridges, culverts and roads were damaged in eastern Boulder County. Th
Other notable flood events in Colorado
Source: NOAA/NCEI Storm Events Database. Deaths and injuries are those NOAA classifies as direct. Damage is the reporting office's estimate at the time and is not inflation-adjusted. This is a catalogue record, not a forecast.