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.

Current News

Miss our June 20 open house? Don't worry ...  you can visit online 

We held an open house Thursday (June 20) to preview the SR 520 / I-5 Express Lanes Connection Project and begin a summerlong community conversation about certain design features of the Portage Bay Bridge and Roanoke Lid Project. If you couldn't make it to the meeting, we'd like to invite you to our online open house. You'll find information and visuals on certain design elements for a replacement Portage Bay Bridge, a highway lid in Seattle's Roanoke neighborhood, and connections to a shared-use trail extension across Portage Bay. And more importantly, you'll find ways to engage with WSDOT and provide feedback on this important project. We’re keeping the door open to this online open house for a few months as we update new information – so visit often.

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