Landslides and landforms data has been placed onto the Washington Geologic Information Portal. We’ve made a few changes to its appearance by dividing the data into separate layers, including 1:24,000- and 1:100,000-scale landslides from geologic mapping, miscellaneous landslides, landslides mapped using watershed analysis protocols, reconnaissance-level landslides, and Salish Sea landforms. We’ve also added the extents of landslide mapping for several layers, including the 1:24,000-scale landslides from geological maps and watershed analysis landslides.
While we’ve made a lot of improvements, this dataset will always be a work in progress. Landslides have not been mapped statewide using the same methods everywhere. This means that if the data doesn’t show a landslide in a given area, it doesn’t mean it’s not there—it is possible that it just hasn’t been mapped.
Suggested citation for the GIS data: Washington Division of Geology and Earth Resources, 2014, Washington State landslides and landforms–GIS data, December, 2014: Washington Division of Geology and Earth Resources Digital Data Series DS-12, version 2.0. [http://www.dnr.wa.gov/publications/ger_portal_landslides_landforms.zip]