King CountyFor more information about this layer please see the GIS Data Catalog . Rock avalanche is a style of landslide characterized by the simultaneous failure of an entire bedrock hillslope and with the dislodged mass cascading to the valley below. Rock avalanches move at extremely high speeds and are potentially massive in size. They can extend farther from the base of slope and cover a much larger area compared with individual rock fall.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/8328cd82c1ef4df6b49f96ca1b96192d_0engKing County GIS Open DataPublicLandslide Hazards along River Corridors - Rock avalanche deposit [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)Last Modified: 2025-07-23