Highway System Plan

The Washington State Highway System Plan (HSP) is the state highway component of the Washington Transportation Plan (WTP). The WTP is the state's overall transportation plan that includes facilities the state owns and those in which the state has an interest, and outlines the policies adopted by the Washington State Transportation Commission. The HSP serves as the basis for the six-year highway program and the two-year biennial budget request to the State Legislature. WSDOT is dedicated to delivering a HSP that implements the Legislature's goals. This is accomplished through the coordination and integration of specific components from many statewide modal and program plans. WSDOT aims first to maintain, preserve, and improve the operating efficiency of the existing highway system before adding to the system.

Previous editions of the HSP can be found at the State Library of Washington

The HSP update (pdf 212 kb) describes the update process currently in progress.

What's Next?

Following the HSP initiation, subsequent steps for the process include a discovery and needs assessment, the financial framework, the scenario analysis, plan development, and plan adoption. WSDOT will engage the community through all steps of plan development. The complete HSP document will be available in 2021.


Highway System Plan Team