Launching into Grays Harbor
A 360-foot-long and 11,000 ton longitudinal pontoon is towed through the launch channel of the SR 520 pontoon construction site. The float-out operations coincided with the high tide late in the evening on April 28, 2013. Crews worked through blustery winds and heavy rain to float-out the six pontoons from the casting basin.
Progress continues on the SR 520 Pontoon Construction Project, as the second cycle of new pontoons left the Aberdeen casting basin overnight April 28 and 29, 2013. The late-night timing coincided with the favorable high tide needed for float-out.
In the second cycle, crews built three longitudinal pontoons, two supplemental stability pontoons and one cross pontoon. The 360-foot-long longitudinal pontoons are the backbone of the new SR 520 floating bridge being built on Lake Washington; the supplemental pontoons provide stability and flotation, and the cross pontoons cap the bridge on the east and west ends. Crews will build a total of six cycles of new pontoons in Aberdeen.
Launching into Grays Harbor
A 360-foot-long and 11,000 ton longitudinal pontoon is towed through the launch channel of the SR 520 pontoon construction site. The float-out operations coincided with the high tide late in the evening on April 28, 2013. Crews worked through blustery winds and heavy rain to float-out the six pontoons from the casting basin.
Progress continues on the SR 520 Pontoon Construction Project, as the second cycle of new pontoons left the Aberdeen casting basin overnight April 28 and 29, 2013. The late-night timing coincided with the favorable high tide needed for float-out.
In the second cycle, crews built three longitudinal pontoons, two supplemental stability pontoons and one cross pontoon. The 360-foot-long longitudinal pontoons are the backbone of the new SR 520 floating bridge being built on Lake Washington; the supplemental pontoons provide stability and flotation, and the cross pontoons cap the bridge on the east and west ends. Crews will build a total of six cycles of new pontoons in Aberdeen.