Progress continues on the SR 520 Pontoon Construction Project, as the third cycle of new pontoons left the Aberdeen casting basin on a sunny Saturday morning, Oct. 5, 2013.
In the third cycle, crews built four longitudinal pontoons and two supplemental stability pontoons. The 360-foot-long longitudinal pontoons are the backbone of the new SR 520 floating bridge being built on Lake Washington and the supplemental pontoons provide additional stability and flotation. Crews will build a total of six cycles of new pontoons in Aberdeen.
For more information visit: www.wsdot.wa.gov/Projects/SR520/Pontoons