SR 520 Bridge Replacement and HOV Program Information to be at Wednesday Market

Two more pontoons are on the move and set to arrive this Saturday


Longitudinal pontoons D and E are currently traveling from Grays Harbor to Lake Washington. Keep up with their progress online and get ready to watch them as they’re towed onto the lake.

Here are the details:

  • Longitudinal pontoons D and E left Grays Harbor on Wednesday, Aug. 13 and are scheduled to travel through the Hiram M. Chittenden Locks on Saturday, Aug. 16 after 6 p.m.

  • Pontoon D will be towed through the Locks by tugboat Nancy M, and Pontoon E will be towed by tugboat Mudcat.

You can also track the latest information on the SR 520 pontoon tracking and bridge assembly page. We’ve posted a map of potential viewing locations in Seattle along the Ship Canal.

Later this month, crews also plan to tow eight supplemental stability pontoons from Tacoma. We’ll keep you posted on their arrivals.

Currently, 60 of the 77 pontoons needed for the new SR 520 floating bridge have been built, and 48 of them have arrived on Lake Washington. Pontoon joining continues on the east side of Lake Washington, where six longitudinal pontoons have already been connected. 

Longitudinal Pontoon C is guided across Lake Union en route to Lake Washington on Monday, Aug. 11. Photo taken from Gasworks Park, looking south.

Longitudinal Pontoon C is guided across Lake Union en route to Lake Washington on Monday, Aug. 11. Photo taken from Gasworks Park, looking south.

Westbound overnight closures – updated schedule below 

Drivers, please be aware of two upcoming overnight closures of SR 520 from 92nd Avenue Northeast to Montlake Boulevard in Seattle.

Currently scheduled westbound overnight closures:

  • 11 p.m. Tuesday, Aug. 19 to 5 a.m. Wednesday, Aug. 20

  • 11 p.m. Thursday, Aug. 21 to 5 a.m. Friday, Aug. 22

The closures that were scheduled for tonight (Thursday, Aug. 14) and for Monday night, Aug. 18, have been cancelled and are NOT taking place.

We continue to post the latest information on the SR 520 Highway Closures web page and the SR 520 Orange Page.

Crews are reaching a major milestone during the closures next week, as they will complete what is expected to be the final concrete deck pour of the West Connection Bridge project, which is scheduled for full completion this fall.

Noisy grinding work to continue on Saturday, Aug. 16

Crews working on the West Connection Bridge have been busy grinding a textured driving surface into the road deck of the new interim bridge structure. Grinding is now scheduled to continue on Saturday, Aug. 16 between 9 a.m. and 10 p.m. Grinding work will wrap-up early next week.

Drivers and nearby residents may notice a loud, consistent noise similar to an industrial fan.

Stop by to chat with us at the Kirkland Wednesday Market on Aug. 20!

Our staff will be out in the neighborhood this coming Wednesday, Aug. 20, at the Kirkland Wednesday Market, located at the Marina Park in downtown Kirkland. We hope to see you and look forward to answering your questions and sharing the latest on SR 520 construction progress. We won’t have flowers or snacks for sale, but we’ll bring a suite of sweet fact sheets, folios and graphics to help explain the work taking place all along the SR 520 corridor.

  • What: SR 520 booth at Kirkland Wednesday Market

  • When: Wednesday, Aug. 20, 2 to 7 p.m.

  • Where: Marina Park, downtown Kirkland

  • Why: To learn more about the SR 520 program and ask questions of the project team

For more on upcoming outreach events and to view photos and materials from past meetings, visit our public outreach page.

Do you cross the SR 520 bridge? Keep an eye out for a bill in the mail

A friendly reminder, if you cross the SR 520 bridge without a Good To Go! account, please keep an eye out for a bill in the mail. We mail bills to the vehicle’s registered owner within 14 days of initially crossing the bridge. If for any reason you don’t get a bill or have questions about a bill, call Good To Go! customer service at 1-866-936-8246. Our customer service representatives can help sort through any issues and help avoid additional penalties.


Even after you receive a toll bill, it’s never too late to open a Good To Go! account and customer service will be able to add the tolls to your account at a lower toll rate. You can find more information online about toll billscivil penalties and what to do if you’re already a Good To Go! customer and receive a bill.