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  • Visit the SR 520 Orange Page for the latest construction and closure information.
  • Pontoon A is moving to its final location on the west end of the floating bridge.
  • Pontoon float-out complete: Crews worked overnight on April 15 to float out six new pontoons from Aberdeen. View photos on Flickr.
  • Videos: Go behind the scenes of SR 520 construction: take our video tour!
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SR 520 Bridge Replacement and HOV Program

Crews successfully floated out the newest six built in Aberdeen from their casting basin into Grays Harbor. The float out took place late into to the night to align with favorable tidal conditions. These six pontoons will be inspected and stored until they travel to Lake Washington to support the new floating bridge. Check out more photos of the float-out on Flickr.

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

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

Questions about tolling?

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

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