May 1, 1999
A very warm and moist pacific storm system allowed for a deep east to southeasterly upslope flow to develop along portions of the Front Range Foothills. Heavy snow occurred in the foothills above 7000 feet with a steady period of moderate rainfall below this elevation. As a result, the normal runoff was accelerated, causing the Cache La Poudre, the Big Thompson and the South Platte Rivers to jump their banks. Several rural roads were either closed due the floodwaters or washed out completely
Source: NOAA National Weather Service Storm Events Database (event 5699836). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Eastern Larimer And Northwestern Weld Counties / Fort Collins And Vicinity / E Larimer / NW Weld County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.