UPDATE: Colorado Highway 3 is officially closed for urgent rockfall mitigation work that began Monday, March 18, 2024. The Colorado Department of Transportation (CDOT) has taken swift action after rocks damaged a retaining fence designed to protect motorists, with the closure expected to last for two weeks.
This critical project comes in response to a significant rockfall event that occurred just before New Year’s, prompting CDOT geohazards geologist Regan French to assess the situation. “It was like a day or two before Christmas,” French explained. “A bunch of rocks had fallen, and I was able to get out here the following week to take a look at it.”
Highway 3, the former main route into Durango located alongside the Animas River, is notorious for rockfall hazards due to its proximity to sandstone cliffs. The retaining fence, which successfully held back falling debris, suffered damage to one of its support posts, necessitating immediate reinforcement.
CDOT has engaged Apex Rockfall Mitigation LLC from Grand Junction for this project. Workers are utilizing a two-rope rappel system to access the cliff, where they are removing loose rocks to ensure safety during repairs. “Dropping loose rocks is the first phase of the project,” French stated. “It makes it safer for workers repairing the fence.”
The next phase will involve drilling new anchors for the replacement posts and downsizing the remaining rock using an excavator with a breaker attachment. This method allows for simultaneous work on the slope and at ground level, maximizing efficiency and safety.
French highlighted the prevalence of rockfall hazards in Colorado, stating, “Colorado has got to be one of the No. 1 states that has to deal with rockfall mitigation.” The CDOT Geohazard Program is actively cataloging slopes across the state to prioritize safety measures and maintenance.
While Highway 3 is closed, CDOT crews will also undertake additional maintenance on the road, including sealing cracks in the asphalt. The entire project is set to conclude by March 20, 2024, ensuring the safety of motorists in the area.
Residents and travelers are advised to seek alternative routes during this essential work, which is crucial for maintaining safe travel conditions in the region. For more updates, stay tuned to CDOT’s official channels as the situation develops.
