Vehicles drive on Interstate 70 in Glenwood Canyon, Colorado

Vehicles drive on interstate I-70 in Glenwood Canyon, Colorado. In the summer of 2021, travelers in Colorado's Glenwood Canyon were safely evacuated before massive debris flows buried highways and destroyed bridges, thanks to a debris flow warning system developed in part by the U.S. Geological Survey. The system alerted Colorado Department of Transportation officials to intense rainfall events, providing crucial lead time for evacuations.