We are pleased to announce the release of a new publication: Landslide inventory update of the Columbia River Gorge in Clark, Skamania, and Klickitat Counties, Washington. The publication consists of a pamphlet summarizing key results and describing the methods used. This publication builds on a 2018 inventory of the Columbia Gorge by mapping additional landslide hazard areas such as alluvial fans, rockfall, and more recent landslides. The new mapping has been added to our WASLID landslide database, which can be viewed on our Geologic Information Portal.
Publication Abstract
Landslides are common in the Columbia River Gorge due to its geologic setting, high relief, steep slopes, and abundant precipitation. In July 2018, the Washington Geological Survey (WGS) published a lidar-based landslide inventory for a 900-square-mile area on the Washington side of the Columbia River following published protocols. This new project updates that landslide inventory by adding new mapping utilizing more-recent high-resolution lidar and imagery. Additional landslide hazard areas such as alluvial fans, rockfall, and more recent landslides, none of which were considered in the 2018 inventory, are included in this new publication. This updated inventory will increase awareness of landslide hazard areas in the Columbia River Gorge and assist planners, emergency managers, public works departments, and those who live and work where landslides could impact their daily lives.
Suggested Citation
Allen, M. D.; Richard, E. M.; Fisher, Kara; Hardesty, Josh; Mickelson, K. A.; Adams, Trent; Lambert, Crystal, 2023, Landslide inventory update of the Columbia River Gorge in Clark, Skamania, and Klickitat Counties, Washington: Washington Geological Survey Report of Investigations 45, 7 p. [https://fortress.wa.gov/dnr/geologydata/publications/ger_ri45_columbia_gorge_landslide_inventory_update.pdf]
Links
Download GIS data:
https://www.dnr.wa.gov/programs-and-services/geology/publications-and-data/gis-data-and-databases
WASHINGTON STATE GEOLOGY NEWS 