SR 520 Bridge Replacement and HOV Program


For the most up-to-date information about SR 520 construction activities and planned road closures, check our SR 520 Construction Corner and its interactive construction map. You also can view Montlake Project construction photos taken daily, 'round the clock, by four mounted construction cameras.

Current News

Low-risk construction resumes on SR 520 Montlake Project

In keeping with Gov. Inslee’s phased approach for reopening Washington’s economy, the SR 520 Montlake Project resumed key low-risk construction activities on May 18. As we restart construction, all crews must follow specific safety protocols (pdf 138) for preventing exposure to the coronavirus, including workers staying at least six feet apart from one another on the jobsite. Initial activities in this low-risk phase of work include removing trees in the median along Montlake Boulevard and removing the former Montlake Market building and 76 gas station. WSDOT temporarily paused most of its construction projects in late March in response to the COVID-19 pandemic and the governor's Stay Home, Stay Healthy order. Read more about the restart of construction in our May 19 email update.

Please visit our Montlake Project online open house, through June 9, and take the survey

Even as Montlake Project construction was suspended, our contractor was putting the finishing touches on the design of key Montlake Project elements. Check out the latest project information in our spring online open house. Open through June 9, it includes a look at project designs, a survey for you to share your priorities, and a preview of upcoming work.

Hop online for our June 3 Montlake Project construction update meeting

You are invited to join our next monthly online Montlake Project construction update meeting, on June 3.  Our project contractor will have a short presentation starting at noon, followed by a Q&A session. You can register for the meeting at

High rollers on the Montlake Project

Two large blue gantry cranes sit on wooden bridges above an old highway that's being removed.

Prior to March's pandemic-related suspension of WSDOT construction, our Montlake Project crews built two massive gantry cranes in Montlake. You can watch this time-lapse video of the crane-assembly process. Crews will use the cranes – and another pair yet to be assembled – to remove the old eastbound SR 520 bridge over Union Bay and build a new one between Montlake and the floating bridge. Attached to giant wheels, the cranes will roll east and west atop temporary work trestles as crews lift out sections of the old bridge and lower in sections of a new, replacement bridge.

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. Built in stages, the construction program's completed and planned improvements extend from I-405 in Bellevue to I-5 in Seattle.

map of the SR 520 corridor's major projects

Click on the map above to visit our SR 520 Major Projects webpage.


Phone: 206-770-3500
Find SR 520 Program contact information: Contact Us


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