Statewide GIS maps & data layers

You can get instant access to state transportation data, maps and interactive map applications.

Online Map Center

The WSDOT Online Map Center provides instant access to a wide variety of data driven map content including interactive map applications, geospatial data layers and printable maps in PDF format.

GIS data download

  • The WSDOT Geospatial Open Data Portal is a centralized distribution site for authoritative WSDOT authored geographic information system data. Data provided here is specific to transportation and used by WSDOT's transportation partners, government entities, schools, private businesses and the general public.
  • For all Washington State Agency GIS Open Data content see the Washington State Geospatial Open Data Portal.

Other featured map applications

  • GeoPortal - view WSDOT spatial data (like functional class, interchange drawings, city limits and state routes) via a web browser. Users can check a box to select from a variety of base maps and data layers. Users can also click on the map to return a State Route Mile Post number or type an address to zoom to. The GeoPortal Help and Users Guide (PDF 2.4 MB) can assist you in learning how to use the application.

  • Survey Monument Database (under Tools, templates & links tab) - use this interactive web page and map application for locating geodetic control monuments. With this application you can view and query WSDOT survey monuments, National Geodetic Survey (NGS) stations, Washington state route mileposts and Washington county boundaries on top of a topographic base map. Use the Monument Mapping Engine User Guide (PDF 3.53 MB) to learn how to use the application. Feedback and data questions should be sent to:

  • Interchange Viewer - view and print drawings of state highway interchange areas, couplets and other select locations in PDF format. While not drawn to scale, these drawings can be used to help locate collisions more accurately, to identify specific ramps and to assist in other planning purposes. The interchange drawings are updated through state highway construction contracts, subsequent on-site inspections and input from WSDOT staff.

8,683 animals crossed the Snoqualmie Pass East Project area

as recorded by WSDOT and partners in 2020 and 2021.

46% increase in Amtrak Cascades ridership to 251,000 passengers

in 2021 compared to 172,000 in 2020.

Nine wetland and stream mitigation sites across 32.7 acres added

to our monitoring program in 2021 to help offset climate change impacts.