Skip Top Navigation


  • SR 520 is on Twitter! Follow us @WSDOT_520 for the latest news.
  • Visit the SR 520 Orange Page for the latest construction and closure information.
  • Contract awarded for SR 520 West Approach Bridge North project. Read more...
  • Check out this video to learn more about the next major phase of SR 520 construction, starting this fall in Seattle.


Multilingual information

SR 520 Bridge Replacement and HOV Program


Floating bridge assembly on Lake Washington marches west from Medina, where crews are busy joining together new pontoons north of the existing highway. (Photo taken Aug. 27 by Ed Bryce)

Building a new and improved SR 520 corridor

The SR 520 Bridge Replacement and HOV Program will enhance safety by replacing the aging floating bridge and keep the region moving with vital transit and roadway improvements throughout the corridor.

The 12.8-mile highway begins at I-5 in Seattle and extends to SR 202 in Redmond.

SR 520 Projects - Click a project title for more information
SR 520 Projects - Click project titles for more information

Contact information:


Phone: 206-770-3500

Infoline: 1-888-520-NEWS (6397)

24-hour construction hotline: 206-708-4657

Twitter: @WSDOT_520

Mail: SR 520 Bridge Replacement and HOV Program
999 3rd Avenue, Suite 900
Seattle, WA 98104

Sign up for email updates about the SR 520 program

Questions about tolling?

Call 1-866-936-8246 or visit Good to Go!

Medina to SR 202: Eastside Transit and HOV ProjectPontoon Construction Project