CAMEO, Colo. (KREX) — Rockfall is typically a result of erosion. Colorado highways are bound to see a fair share of rockfall, especially when snow melts leaving more moisture on the ground.

“In the spring, in particular, you also get some of the freeze-thaw effects with temperature fluctuations above and below freezing,” CDOT Geohazards Program Manager Bob Group informs “So, it’s not unusual to see activity pickup around this time of year.”

Bob Group with CDOT’s geotechnical team points out the entire De Beque Canyon is susceptible to dangerous rockfall, from Debeque to Palisade. There is, however, a natural process that happens where the surroundings need certain requirements.

“The shale erodes from underneath the sandstone,” Group elaborates, “When enough of that disappears, then those sandstone blocks can fall down and enter the roadway.”

De Beque Canyon isn’t the only place in our area rockfall threatens.

“Highway 65 over at Grand Mesa, Highway 39 over Douglas pass, anywhere you get those sandstone cliffs with some of those shale layers would be prone to rockfall,” Group mentions.

Whether you see a sign or not, it’s best to drive alert, especially with more cars on the road and warmer weather on the horizon.

“Nobody expects to see a rock in the middle of the road as you’re driving on a highway but it’s just a good idea to keep some awareness out for what might be in the roadway,” Group concurs.