SR 520 Bridge Replacement and HOV Program


For the most up-to-date information about SR 520 construction activities and planned closures, check our SR 520 Construction Corner and its interactive construction map.

Current News

Major reconstruction on SR 520, including nighttime work, kicks off in Montlake 

Construction of the SR 520 Montlake Project has moved into high gear with contractor crews now preparing a work zone for building a Montlake lid over the highway, an improved Montlake Boulevard interchange, and other corridor enhancements. Read more about this work in our latest news release. To limit weekday traffic disruptions and enhance crew safety, a significant amount of the construction will occur at night under a project-long noise variance, effective Aug. 16. 

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


Eastside projectPontoon project