Each supplemental stability pontoon is comprised of eight cells separated by concrete walls.
Doorways like the one seen at the top of this photo will allow maintenance workers to access each of the cells.
The doorway at the bottom of this photo is a temporary access point. It will be filled in with rebar and concrete before the pontoon is completed.
Posted by WSDOT on 2013-01-11 08:10:09
Tagged: , Tacoma , SR 520 , WSDOT , Floating Bridge and Landings Project , ^NK , SR 520 Bridge