Corridor sketch initiative

Corridor sketch summaries describe the functionality and features of our state highways. Each summary has information that guides highway improvements.

The Corridor Sketch Status brochure (pdf 726 kb) describes the program and its accomplishments.

The User Guide for Corridor Sketch Summaries (pdf 428 kb) provides a brief description of information presented in each summary along with potential strategies to address congested areas of the highway.

Corridor sketch summaries

 

Corridor Sketch summary map

 

View Corridor Sketch Summary map

Summary reports by region

Eastern Region

North Central Region

Northwest Region

Olympic Region

South Central Region

Southwest Region

Contact:

For questions regarding specific corridors, please refer to the last page of the corresponding Corridor Sketch Summary (pdf link) for contact information.

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.