Travel Center

Avalanche Control


Every winter, CDOT regularly monitors and/or controls some 278 of the 522 known avalanche paths in Colorado to help prevent avalanches from impacting Colorado highways.

To help predict avalanche conditions and the necessity for avalanche control, CDOT teams up with the Colorado Avalanche Information Center, which studies forecasts and current weather conditions. Some factors that increase the risk of avalanche danger are large quantities of new snow, high winds and drastic changes in temperatures.

When there is a high risk of avalanche danger, CDOT will close highways at the location of the avalanche path in order to conduct avalanche control.  Once all the unstable snow has been brought down, CDOT crews have to clear all of the snow and debris from the roadway before reopening the highway to traffic. Since it is impossible to predict how much snow will be brought down during a control mission, CDOT cannot estimate how long a highway closure will be in place. CDOT will open the highway as soon as it is safe for the traveling public.

Anytime CDOT conducts avalanche control, messages will be posted on electronic signs in order to inform motorists of the road closure.  In addition, motorists can visit the web at or call 511 for current road and weather information and updates on avalanche control work.  Motorists can also sign up for e-mail and text message alerts.

During the 2013-2014 winter, CDOT experienced 616 hours of road closures due to avalanche control, resulting in a total of 29,866 feet of snow covering the centerline of the roadway. Crews triggered 283 avalanches with explosives, handled 158 natural occurrences and spent 8,908 hours on mitigation.

For additional information on CDOT's Avalanche Program and avalanche data, please click here.

Click here to view a video on avalanche mitigation.

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Colorado: The Official State Web Portal