Library & research reports

Take a look at available library services and find current information about transportation research projects and reports.

Discover library services available to you, search our collections, access digital materials and contact our librarians.

Learn about applied transportation research conducted by WSDOT. Find information on current research projects, access research reports, watch our webinars, view our Research Procedures Manual and contact our research managers.

Check out these tools to find definitions of terms and decode common abbreviations used by WSDOT.

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.