New York State Thruway Authority

High Steel Structures, based in Lancaster, has fabricated more than 800 steel girders used to construct the new Tappen Zee Bridge (officially called the Governor Mario M. Cuomo Bridge) in New York. The final girder will begin its journey north this Friday.

The first span of the new Tappen Zee Bridge is scheduled to open later this month. The bridge, which is scheduled to open in 2018 and cost $3.98 billion, is one of the biggest active bridge projects in the nation and the largest in the history of the New York State Thruway Authority.

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High Steel Structures

A steel beam for the new Tappen Zee Bridge prepares to depart from the High Steel Williamsport plant.

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New York State Thruway Authority

The massive assemblies for the new bridge are created with interwoven networks of welded plate girders. May 21, 2015

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New York State Thruway Authority

Workers prepare a massive steel-blue girder assembly for installation from the Westchester abutment. Oct. 1, 2015

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New York State Thruway Authority

More than a mile of structural steel is installed on the bridge's Rockland approach. April 19, 2016

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New York State Thruway Authority

I Lift NY raises the final westbound girder assembly, weighing more than 700 tons. Oct. 6, 2016

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New York State Thruway Authority

The project's super crane, used to install the bridge's structural steel, is capable of raising up to 1,900 tons at once. Sept. 27, 2016

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New York State Thruway Authority

Workers oversee the lowering of a structural steel section on the main span. Feb. 4, 2017

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New York State Thruway Authority

I Lift NY raises a section of the bridge's structural steel. Feb. 4, 2017

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New York State Thruway Authority

A worker helps guide a prefabricated road deck panel into place. July 22, 2016

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New York State Thruway Authority

An ironworker helps guide the placement of the final section of westbound steel. March 25, 2017

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New York State Thruway Authority

An ironworker helps guide a new steel girder segment to its final position. March 10, 2016

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New York State Thruway Authority

The eastbound bridge's main span is connected to the Westchester approach. July 19, 2017

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New York State Thruway Authority

The project team tests the westbound bridge's aesthetic lighting system. May 31, 2017