New Idaho Landslide Inventory Database to Assist with Hazard Mitigation
June 29, 2021
MOSCOW, Idaho — June 29, 2021 — The Idaho Geological Survey (IGS) has released a new statewide inventory of landslides that will assist emergency managers and planners with hazard mitigation and identification of problematic hot spots.
The project was sponsored by the Idaho Transportation Department (ITD) and performed by the IGS, a state agency hosted by the University of Idaho as a special program in the university’s Office of Research and Economic Development.
The inventory, which contains more than 2,400 landslide entries spanning from prehistoric to active events, is posted on the IGS website and can be accessed through an interactive webmap service. Data were compiled from archives, unpublished IGS field observations, analysis of LiDAR derived imagery, satellite images and newly mapped landslides. ITD has also incorporated the information in its highway plans.
“The study represents a live catalog of mass movements across the state with a particular focus on transportation corridors and urban areas,” said Claudio Berti, state geologist and IGS director. “The database is a tool for documenting and assessing slope stability hazards. It is not intended to predict future events, but to document known events and show broad patterns of occurrence.”
The database replaces a static map published in 1991 not suitable for modern digital analyses and will be kept up to date as new events occur or new information becomes available. Field data collection applications were developed to aid in this effort and facilitate uniform and rapid information input by IGS and ITD personnel.
Landslide problem areas in Idaho include: Bonners Ferry, Clearwater River Basin, Horseshoe Bend, Boise Foothills, Hagerman, U.S. 95 between Pollock and Lucile and Highway 26 between Swan Valley and the Wyoming border. Geologic characteristics of the bedrock, fractures, systems, precipitation, regional hydrogeology, vegetation, wildfires and steepness of hillslopes are contributing factors in landslide initiation and development.
State Geologist, Idaho Geological Survey Director
About the University of Idaho
The University of Idaho, home of the Vandals, is Idaho’s land-grant, national research university. From its residential campus in Moscow, U of I serves the state of Idaho through educational centers in Boise, Coeur d’Alene and Idaho Falls, nine research and Extension centers, plus Extension offices in 42 counties. Home to nearly 11,000 students statewide, U of I is a leader in student-centered learning and excels at interdisciplinary research, service to businesses and communities, and in advancing diversity, citizenship and global outreach. U of I competes in the Big Sky and Western Athletic conferences. Learn more at uidaho.edu