Tacoma— Kiewit-General and the Washington State Department of Transportation have reached their biggest milestone since Hood Canal Bridge pontoon construction began three years ago by completing the final concrete pour on the last of the 14 new Hood Canal Bridge pontoons on June 27.
The final concrete pour started at 5:22 a.m. and wrapped up about 11:20 a.m. at Concrete Technology Corporation in Tacoma. The 430 cubic yards placed for the top slab on pontoon W brought the total concrete used in pontoon construction to more than 29,000 cubic yards. That's enough to pave one lane of highway 12.3 miles in 1 foot of concrete.
"This marks the end of a huge collective effort," said WSDOT site manager Dewayne Matlock. "The scale of the pontoon construction was enormous, and with it completed, we can focus on getting the pontoons up to Seattle for outfitting."
After post-tensioning work is conducted, pontoons U and W will be floated from CTC to Todd Pacific Shipyards in Seattle in early August. There they will be outfitted with columns, roadway, electrical equipment, and mechanical parts.
Construction of pontoons U and W — which measure 360 feet long, 60 feet wide and 18 feet tall, and 325 feet long, 60 feet wide and 18 feet tall, respectively — marks the end of the fourth and final pontoon cycle. It is also another milestone reached on the way to the east-half bridge replacement process scheduled to occur during the six-week Hood Canal Bridge closure in May-June 2009.