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SR 520 Bridge Replacement and HOV Program


Current News

Learn about "MWDBE" SR 520 A&E contract opportunities and getting your rates approved at June 2 open house
WSDOT is hosting an open house on June 2 (pdf 217kb) at the Seattle Central Library to promote potential SR 520 contract opportunities in engineering and design for Minority, Women and Disadvantaged Business Enterprises (MWDBE). Attendees should RSVP via email by May 26 at

SR 520 design team receives award for “smarter” lid design
The SR 520 team that created the conceptual designs for the highway’s planned improvements between I-5 and the new SR 520 floating bridge recently received a 2015 Civic Design Award from the American Institute of Architecture (AIA) Washington Council. Read more ...

Program Overview

The SR 520 Bridge Replacement and HOV Program is enhancing public safety and mobility by replacing the highway's aging, vulnerable bridges and making significant transit and roadway improvements throughout the corridor. The construction program's planned improvements extend from I-5 in Seattle to I-405 in Bellevue.

Click a project title for more information
SR 520 Projects - Click project titles for more information

Project photos on Flickr

final pontoon float-in View latest project photos on Flickr.

Live construction cameras

installation of east transition span
See views from live construction cameras.

Contact Information:  



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Phone: 206-770-3500

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