WSDOT Online Map CenterThis map service depicts historic data for the Washington State Route 24k linear referencing system including state routes, ramps, turnbacks, accumulated route mile points, ferry terminals and proposed state routes. This service is maintained by the WSDOT GIS and Roadway Data Office. If you are having trouble viewing the service, please email onlinemapsupport@wsdot.wa.gov. If you have questions about the data please email TransportationGISDataSteward@wsdot.wa.gov.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/abc7f559e5844dc0af2cb8d7eee379bc_3engState of Washington Geospatial Open Data PortalPublicWSDOT - State Route Line (1:24K) 2025 [Washington (State)]Web servicesWashington (State)2025