• Project

SR 520 Pontoon Construction Project

Project overview

The SR 520 floating bridge is supported and stabilized by 77 concrete pontoons . The Pontoon Construction Project built a casting basin and 33 of the bridge’s pontoons in Aberdeen, Washington. We built 44 of the bridge’s smaller pontoons in Tacoma, Washington, as part of the Floating Bridge and Landings Project.

Timeline
Construction of the casting basin and pontoons began in Aberdeen in 2011. Pontoon construction ended in spring 2015.
Project status
Completed
Funding
$515 Million

What to expect

The pontoons constructed for this project now support the new SR 520 Floating Bridge. SR 520 travelers now have a safer, higher-capacity bridge with new, dedicated HOV/transit lanes and a 14-foot-wide bicycle and pedestrian path.

Location of the former WSDOT pontoon casting basin in Aberdeen, Washington.