King CountyFor more information about this layer please see the GIS Data Catalog . Depositional fans are formed when sediment moving down a steep channel is deposited where the channel gradient abruptly decreases, for example where a steep valley-wall tributary reaches the valley floor. Sediment can be carried down such a steep channel in flow-type landslides (debris flows, debris floods) or as sediment can be carried by streamflow. Fans are subject to a range of hazards depending which of the preceding processes are active.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/d0b24035c4524927a94561d87088a47d_0engKing County GIS Open DataPublicLandslide Hazards along River Corridors - Lowland fans [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)Last Modified: 2025-07-23