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SR 520 Bridge Replacement and HOV Program


The new SR 520 floating bridge opened to eastbound traffic on Monday, April 25, and is now carrying vehicles in both directions. For information about SR 520 closures and construction activities, visit our SR 520 Orange Page.

Current News

The April 25 opening of eastbound lanes on the new floating bridge, shown at right, is a crowning achievement for the SR 520 construction program. You can watch the new bridge's April 11 maiden voyage of westbound traffic on YouTube.
What a party!
 A big thank you to the thousands who helped us celebrate the April 2 & 3 Grand Opening of the new SR 520 floating bridge. If you missed it, check out some photos of the celebration or watch this video of the ribbon cutting. You can also see some of the informational display boards that were posted on the bridge during the event!

We made tremendous progress with SR 520 construction in 2015. Learn about the key milestones we hit in the past year and what's in store on the project for 2016 by reading our 2015 Year in Review newsletter.

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

Project photos on Flickr

View the latest SR 520 project photos on Flickr.

Live construction cameras

installation of east transition span
See views from live 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 Project