Five 1.2m-diameter columns have been built, standing approximately 16.7m tall.
Pontoon W was one of six pontoons that needed additional repairs after crews working on the bridge found end-wall cracking and interior spalling in May.
The pontoon is at the east end of Lake Washington in the US state of Washington. Pontoon W’s columns mark the transition from the floating section to land-based supports for the new six-lane bridge and highway.
Since then, the Washington State Department of Transportation has reported construction issues and repairs, and continues to provide updates regarding the status of the pontoons.
“We are moving ahead with major work on Lake Washington because there is no question that when complete these pontoons will support the world’s longest floating bridge for 75 years or more,” said Julie Meredith, SR 520 program director. “With each new column that goes up on Lake Washington, drivers can see measureable progress toward replacing the vulnerable SR 520 floating bridge.”
Nine pontoons are on Lake Washington, including five built in Aberdeen and four in Tacoma. Three pontoons are still being worked on in Tacoma.
