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

Shine a light on your cause or organization

The tall towers, or sentinels, at the east and west ends of the new SR 520 floating bridge typically cast a teal-colored glow at night. But we can change their color in recognition of worthy public events or causes, as we did with the hues shown here for World Neurofibromatosis Awareness Day. You'll find more information about the sentinels and how to request a change in their color on our sentinel webpage

It's time to hit the trail!

bicyclist and pedestrians on SR 520 Trail

The SR 520 Trail opened across Lake Washington in December following completion of the West Approach Bridge North. With springtime weather upon us, trail trekking is even more inviting now. But don't take our word for it. Watch this video to hear what trail users are saying about the cross-lake path. And 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




Phone: 206-770-3500
More information on Program Contact Us

Eastside projectPontoon project