King CountyFor more information about this layer please see the GIS Data Catalog . Evacuation routes were developed for the potential inundation of the lower, middle, and upper Green River Valley areas. The routes are marked by evacuation signs to lead the traveling public out of the valley to higher ground.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/1f220c2414014b54af3c7505321abf53_0engKing County GIS Open DataPublicEvacuation Routes for Green River Valley [Washington (State)--King County]Web servicesWashington (State)--King CountyWashington (State)Last Modified: 2025-08-01