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SR 520 Bridge Replacement and HOV Program


The SR 520 floating bridge and mainline are open. There are no SR 520 highway closures scheduled at this time. For more information about SR 520 closures and construction activities, visit our SR 520 Orange Page

Crews on the West Approach Bridge North Project will close Lake Washington Boulevard in Seattle’s Montlake area from 7 p.m. Friday, July 17 to 10 p.m. Sunday, July 19. For more information, visit our SR 520 Orange Page.

Current News

Registration open for late July and early August SR 520 public tours
Registration is now open for the July 25 public tour of the new floating bridge and the August 5 public tour of the West Approach Bridge North project. Find out more and register on our Public Tour Information page.

Tolls increasing on SR 520 July 1 
Drivers who cross Lake Washington using the SR 520 Bridge are reminded that new toll rates will go into effect Wednesday, July 1. Read more from our latest program email update.

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 including the winning pontoon photo contest winners.

Live construction cameras

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

Contact Information:  



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Phone: 206-770-3500

More information on Program Contact Us