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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

Find your happy on the SR 520 Trail

runners on the SR 520 Trail

Rain or shine, the regional SR 520 Trail, now open between Seattle and the Eastside, offers a great way to get some fresh air and take in some great views. You'll find useful trail-connection maps on our new SR 520 Trail webpage, and a pictorial history of the trail in our newest SR 520 Flickr album.

2017 Year in Review coverNotable SR 520 milestones reached in past year

Besides extending the SR 520 Trail across Lake Washington in 2017, our crews made a lot of other progress over the year, including completing the West Approach Bridge North and lengthening the highway's bus/carpool lanes. Take a look at the year's highlights in our 2017 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

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