The combination of weak soils on steep slopes and a heavy rain downpour lead to this muddy debris flow in 2009 in Whatcom County: Photo: D. Hooks/DNR
Landslides are a continuing problem along the hillsides and shorelines of Washington. Our climate , topography, and geology create a perfect setting for landslides. In Western Washington, most landslides happen in fall and winter, which is when we tend to get big storms with heavy rainfall.
See our latest map of recent landslides
DNR collects landslide data for several reasons. As the population of Washington grows, there are increasing pressures to develop housing and businesses in landslide-prone areas. Knowing the location of these landslide hazards has never been more important to public safety.
DNR’s Geology and Earth Resources Division is helping to increase understanding of landslide processes in Washington state through numerous research projects. Our main research project focuses on Puget Sound basin landslide processes. We want to help counties and citizen understand the critical risk areas when making decisions about land use.
Report a landslide in your area. Learn more about landslide risks in shoreline areas from the Washington Department of Ecology.
View shore stability maps to see where landslide are more likely.
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Tags: DNR, landslide, Puget Sound, Washington
