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SR 520 Bridge Replacement and HOV Program


The SR 520 floating bridge and mainline are currently open.  For more information about SR 520 closures and construction activities, visit our SR 520 Orange Page.

The 24th Avenue East bridge is closed to bicyclists and pedestrians until early 2016. For a detour route around the closure, visit our WABN website.

Current News

Take a virtual tour of SR 520! If you missed our summer site tours, you can enjoy a video tour of the floating bridge and WABN projects from the comfort of your living room or office!

The concrete roadway deck of the new SR 520 floating bridge is complete! Read our blog to learn more about this big milestone and the work that remains before we open the new bridge to traffic next spring.

Lake Washington is a better home for young salmon thanks to a shoreline-restoration project supported by the SR 520 Program. Learn more here.

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