Images

Debris flow deposit in the North Fork Feather River, Plumas County, CA near the Dixie burn area.  

The USGS “Heil Ranch” site is located in the Arapahoe-Roosevelt National Forest in Colorado. The site consists of instrumentation monitoring the rainfall and soil moisture.

The USGS Puerto Rico Landslide Susceptibility Map provides an interactive tool to assess landslide risk in Puerto Rico from low susceptibility to extremely high.

Completed landslide monitoring station at Adjuntas, Puerto Rico among the palms.

Completed landslide monitoring station at Adjuntas, Puerto Rico among the palms. One of the sites in the Puerto Rico Landslide Monitoring Network.

Kelli Baxstrom wires sensors to a datalogger after sensors are installed underground at the Adjuntas, Puerto Rico, landslide monitoring site, part of the Puerto Rico Landslide Monitoring Network.

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.

Interstate 70 through Glenwood Canyon, Colorado. In the summer of 2021, travelers in Colorado's Glenwood Canyon were safely evacuated before massive mounds of mud and rocks buried highways and destroyed bridges, thanks to a debris flow warning system developed in part by the USGS.

Debris flow in Glenwood Canyon during the summer of 2021. This event followed the 2020 Grizzly Creek Fire in Glenwood Canyon, Colorado. 

Interstate 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.

USGS scientist assesses debris flow in Glenwood Canyon, Colorado. This post-wildfire debris flow follows the 2020 Grizzly Creek Fire. 

Scientists assess post wildfire debris flow following the 2020 Grizzly Creek fire. 

Kelli Baxstrom excavates a pit for sensor installation at a monitoring site in Maricao, Puerto Rico.

Rockslide on California State Route 70 in the Feather River Canyon, Butte/Plumas county line, northern California. This slide was triggered on October 24, 2021 by a Category 5 atmospheric river, which released more than ten inches of rain in the area over a 48-hour period. Approximately seven thousand cubic yards of rock and debris buried and closed the highway.

The USGS “Chambers” site is located in the Plumas National Forest in northern California. The site consists of instrumentation monitoring the hillslope in the lower part of the image. The hillslope exhibits moderate soil burn severity and hosts sandy soils derived from granitic bedrock.

The USGS “Chips” site is located in the Plumas National Forest in northern California. The site consists of instrumentation monitoring the hillslope in the lower part of the image. The hillslope exhibits moderate soil burn severity and hosts silty soils derived from metamorphic bedrock.

Debris flow caused by intense rainfall from Tropical Storm Fred in August 2021. Haywood County, NC. 

The hillslopes above Cinnamon Creek within the Grizzly Creek burn area one year following the Grizzly Creek fire.  

Hillslope recovery along Blue Gulch in the Grizzly Creek burn area.  This photo was taken approximately 1 year following the Grizzly Creek fire. 

Ground level view of debris covering the eastbound lane of I-70 following the June 26-27, 2021, storms. The green sign in the background indicating Milepost 120 is mostly buried by mud.

2020 Calwood Fire burn area, Boulder County, Colorado. This overview photo looking west from the ridge separating the 'Calwood' side of the burn area from the 'Heil Ranch' side.  The photo was taken approximately 7 months after the fire, which occurred in the fall of 2020.