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Third batch of State Route 520 Bridge Pontoons to float from Aberdeen

ABERDEEN, Wash. – The third cycle of pontoons headed for the State Route 520 bridge will float out of the Aberdeen casting basin later this week. 

SR520 Pontoon float path

Sara Phelan with the Washington State Department of Transportation tells us the float-out of these next six pontoons marks the halfway point for the Aberdeen site. WSDOT has now completed 38 of 77 pontoons needed for the new SR 520 floating bridge. In all, crews will build 77 pontoons – 33 constructed in Aberdeen and 44 in Tacoma – for the new SR 520 floating bridge. With the third Aberdeen cycle complete, crews have finished 18 pontoons in Aberdeen and 20 in Tacoma.


The first of six pontoons will leave the casting basin around 10 Saturday morning.

Just like the last float-out, the huge concrete structures need to leave the port facility during the highest tides possible. The pontoons will then be towed to a separate moorage facility in Grays Harbor until they are towed 260 nautical miles around the Olympic Peninsula to Lake Washington at a later date.

SR520 Pontoon Construction Site in Aberdeen

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