Washington State Department of Transportation (WSDOT)This is an extract from the State Highway Log that shows tunnels along State Routes. Details include: tunnel length (in miles), structure number, structure ID, and structure narrative. State Route identifiers and locations based on State Route Mileposts and Accumulated Route Mileage are also included for geographic reference and for use with the Washington State Department of Transportation's 24k and 500k Linear Referencing Systems. Please direct questions about this dataset to: TransportationGISDataSteward@wsdot.wa.gov.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/8a0b7336c568428faed36a67beae8075_13engState of Washington Geospatial Open Data PortalPublicWSDOT - Roadway Data Tunnels [Washington (State)]Web servicesWashington (State)Last Modified: 2025-10-07