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City News

Posted on: September 25, 2023

WSDOT I-405/SR 522 Interchange Improvement Project

I405 Interchange Concept

The Washington State Department of Transportation (WSDOT) and Sound Transit awarded a design-build contract for a multi-year project along a segment of I-405 that will extend the dual express toll lane (ETL) system and improve the flow of traffic on the Eastside. The I-405, Brickyard to SR 527 Improvement Project does not run through the City of Woodinville; however, the project scope includes major reconstruction of the I-405/SR 522 interchange, impacting travel in and out of town. Here's what you need to know:

The I-405, Brickyard to SR 527 Improvement Project lies primarily in Bothell on I-405, starting just south of the SR 522 interchange and ending at the SR 527 interchange. Enhancements will be made to four and a half miles of the corridor in the area, focusing on improving transportation mobility and reliability throughout the region. 

Improvements will include increased express toll lane (ETL) capacity and direct access to state highways. This includes building one new express toll lane in each direction between south of SR 522 and SR 527 (extending the existing dual express toll lane system), widening I-405 through the SR 522 interchange, and building direct access ramps to the express toll lanes at SR 522, and a partial direct access interchange at SR 527 to and from the south connecting to the Canyon Park Park and Ride. Additionally, the I-405 improvements will help pave the way for a future expansion of Sound Transit’s Stride S2 Line adding new bus rapid transit service between Lynwood and Bellevue. 

I405 Interchange Concept

This is a visualization of the future improvements to the SR 522 interchange area. The improvements include a new center direct access ramp to I-405 express toll lanes, a new bridge for northbound I-405 traffic, and dual southbound I-405 express toll lanes on existing northbound structure.



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