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Contract Awarded for I-405 Corridor Improvements Including Multimodal Mobility, Bus Rapid Transit

BOTHELL, WA — The Washington State Department of Transportation and Sound Transit recently awarded a design-build contract for a multiyear project along a segment of Interstate 405 that will extend the dual express toll lane (ETL) system and improve the flow of traffic on the Eastside.

Design-build contracts combine a project’s final design and its construction into a single contract. Contractor Skanska’s $834 million bid had the winning combination of price and technical expertise, meeting the “apparent best value” bid requirements. Construction is expected to begin in late 2023, and the new-look roadways will open to traffic in 2028.

Once complete, Sound Transit’s Stride bus rapid transit (BRT) service will use the ETLs and center freeway stations, thus removing buses from general-purpose traffic lanes. The new BRT system along I-405 will increase connectivity and improve access to the regional transit system and save time for travelers and residents in Bothell, Kirkland, and surrounding communities.

The I-405, Brickyard to SR 527 Improvement Project lies primarily in Bothell on Interstate 405, starting south of the SR 522 interchange near the Brickyard Park-and-Ride and ending at the SR 527 interchange. The project will enhance and expand 4.5 miles along the corridor.

Contractor crews will create one new ETL in each direction just south of SR 522 to SR 527, providing relief to the general-purpose lanes and moving more people through all lanes. It also creates direct access ramps to the ETLs at SR 522 and a partial direct access interchange at SR 527 connecting to the Canyon Park Park-and-Ride, relieving bottlenecks in key areas.

Significant improvements for transit riders and carpoolers are also components of this project. For people who ride transit locally and regionally, improvements include additional connections to regional transit service at the Canyon Park Park-and-Ride and the future UW Bothell Station. The Brickyard station will serve Bothell and Kirkland with a new transit-only inline BRT station facility to support the I-405 Stride BRT service, improving connections to the community and existing park and ride. The project will ensure the community has better local connections and improved roadways for people who walk, bike, roll, drive, and ride transit to — and through — the area.

“Our partnership with Sound Transit is crucial for this project. By creating more connections to regional transit service and aligning with Sound Transit's plans for bus rapid transit, we're enhancing convenience and accessibility,” said Lisa Hodgson, WSDOT I-405/SR 167 Program Administrator. “The inclusion of the second express toll lane will provide more opportunity for a faster, reliable trip when you need it, providing a better commute for all lanes.”

Funded by toll revenue, the Move Ahead Washington package, and Sound Transit, this project also includes local roadway improvements, fish barrier corrections, noise walls, and new stormwater facilities.

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