The first of 134 assembled steel girder units that will support the Tappan Zee Bridge’s six miles of roadway arrived by barge from upstate New York.
The piece measures 400 feet long, weighs 1,100 tons and is made of three prefabricated curves steel girders. The tower crane known as the Left Coast Lifter hoisted the first girder into place in between two concrete piers.
The individual girders are 120 feet long, weigh 105 tons, and stand 12 feet high. More than 100,000 tons of U.S. steel will be used to complete the process of placing all 134 girders.
The largest assembled units measure 410 feet long and weigh 1,100 tons. They are secured with high-strength nuts and bolts, some eight inches long.