Event narrative (NOAA)
Multiple debris flows occurred along Interstate 70 within the Grizzly Creek Fire burn scar between mile marker 123 and Hanging Lake Tunnel. Colorado Department of Transportation (CDOT) described the damage from the new flows as extreme. The new debris piles were around 17 feet tall over the roadway and house-sized boulders fell as well. Hanging Lake trail received considerable damage. At least seven bridges were either destroyed, washed downstream or otherwise severely damaged. National Forest officials say it will be at least late-season 2022 before the trail can be reopened.
Other notable debris flow events in Colorado
Source: NOAA/NCEI Storm Events Database. Deaths and injuries are those NOAA classifies as direct. Damage is the reporting office's estimate at the time and is not inflation-adjusted. This is a catalogue record, not a forecast.