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SR 520 - Floating Bridge and Landings Project: What's Happening Now?

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Updated: April 8, 2015

Construction activities for the new SR 520 floating bridge and landings are underway.

We are currently assembling the new floating bridge on Lake Washington and continue to build bridge components at locations in Aberdeen, Tacoma and Kenmore. 

Current work

Lane and Ramp Closures

Visit the SR 520 Orange Page for specific dates and times.


Lake Washington

Aerial view of the SR 520 floating bridge construction site
See more photos from
Lake Washington , Tacoma ,
and Kenmore on our Flickr site .

Crews continue to join pontoons on Lake Washington. The final pontoons will be joined in late 2015 and the new bridge will open to traffic in spring 2016.

The contractor is building sections of the west high-rise near the Medina shoreline. These three pontoons and superstructure will be moved to the west side of Lake Washington in June 2015. 

Construction activities and project barges periodically block the east navigation channel. These obstructions alter use of the east navigational channel and SR 520 drawspan. Read more information for boaters and SR 520 drivers.



See the latest activity on our Medina construction camera . Curious what you're looking at? Check out this guide .

The new bridge maintenance facility is currently being outfitted with electrical and drywall finishes. 

Joining of longitudinal pontoons is more than half-way complete and pontoons now block the center drawspan in the existing bridge.

In April 2015, crews will work to assemble eight large steel girders that will be installed as the second part of the "hinged" transition span.


See the latest activity on our Kenmore construction camera . Curious what you're looking at? Check out this guide .

Casting of the concrete deck sections began in March 2014 and to date, more than half of the 776 sections have been built. 

Crews will continue to construct the roadway deck sections through fall 2015. A total of 776 sections are needed to complete the roadway for the new floating bridge.

For more information about the work planned in Kenmore, view our project page .



See the latest activity on our Tacoma construction camera . Curious what you're looking at? Check out this guide .

In December 2014, crews completed construction of all 44 supplemental stability pontoons being built in Tacoma. At this time, no other SR 520 construction activities are planned in Tacoma.

Check out photos of construction in Tacoma on our Flickr page .



On March 10, 2015, crews floated the sixth and final cycle of pontoons from the casting facility in Aberdeen. The last three pontoons arrived on Lake Washington on April 9, 2015. 

You can find more information on the Pontoon Construction Project on the project website .

Watch our YouTube video  to learn more about the float-out process.