View interactive maps of all the mileposts and Interstate exits on the Washington state highway system, or download and print PDF maps of the Washington state highway system.

Click on the map near a state route to add a point at the nearest milepost. This website requires WebGL2. Locates mileposts along Washington State Routes, as defined by the Washington State Department of Transportation's Linear Referencing System.

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The purpose of this map is to display the County Road Mileposts that have been established by the counties, however this does not always infer County ownership as some county roads …

May 25, 2023 · The debris flow damaged the upper portion of State Route 504 near milepost (MP) 49 leading up to the Johnston Ridge Observatory north of Mount St. Helens. The area impacted only affects the last eight miles of SR 504 and some associated trailheads and recreation sites.

Olympic Milepost 248 Valve Site is in Clark County, Washington. Mapcarta, the open map.

State Route 503 (SR 503) is a 54.11-mile-long (87.08 km) state highway serving Clark and Cowlitz counties in the U.S. state of Washington.

Explore WSDOT's interactive web mapping site for data, maps, and applications related to transportation in Washington.

Under 23 U.S. Code 148 and 23 U.S. Code 407, safety data, reports, surveys, schedules, list complied or collected for the purpose of identifying, evaluating, or planning the safet