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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 Orange Page.

Current News

Join us on "520 Day" for a celebration on the SR 520 Trail

bicyclist and pedestrians on SR 520 Trail

The SR 520 Trail opened across Lake Washington in December, but now that the weather's warmed, we're having an official ribbon-cutting ceremony on Sunday, May 20 -- "520 Day." We hope you'll join us! You also can watch a video to hear what trail users are saying about the path or learn about trail connections on our SR 520 Trail webpage.

Learn about next phase of SR 520 construction in Seattle
More than 250 people attended our April 17 open house in Montlake to learn more about the next phase of SR 520 construction in Seattle. Miss the meeting? You'll find all of the open house's informational boards in our Resource Library. You also can read our latest blog, which answers questions and concerns we heard at the open house.

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 Program map

Project photos on Flickr

View the latest SR 520 project photos on Flickr .

Construction cameras

View archived photos taken 'round the clock by mounted construction cameras .

Contact Information:  



Good To Go!



Phone: 206-770-3500

More information on Program Contact Us


West Approach Bridge North ProjectI-5 to Lake WashingtonFloating Bridge and Landings ProjectEastside Transit and HOV ProjectPontoon Construction ProjectEastside projectPontoon project