High Steel Structures workers stood in the rain, cheered and applauded as they watched the final two “superload” girders for the new Tappan Zee Bridge in New York leave the Williamsport plant. The massive blue girders, each 12 feet high, 120 feet long and weighing 78 tons, left the plant Tuesday morning with police escorts headed for the bridge project assembly yard in Coeymans, N.Y. High Steel at its Williamsport and Lancaster plants have fabricated approximately 50,000 tons of steel to form the approach spans to the new bridge.