HNTB Helps Fast Track Replacement of New York’s Tappan Zee Bridge
- Design-build project is largest single civil construction contract awarded in New York
- New cable-stayed bridge will ease congestion at a crucial Hudson River Crossing
As owner’s engineer for the New York State Thruway Authority, HNTB helped to replace at an extraordinarily fast pace the 62-year-old Tappan Zee Bridge over the Hudson River. The design-build project is the largest single civil contract awarded in New York.
HNTB’s responsibilities as the owner’s engineer included managing the contract to get maximum value for toll payers, monitoring design and construction, auditing and verifying quality assurance, assisting with the complex maintenance of traffic and managing environmental mitigation.
The new bridge carries 50 million vehicles a year and eases congestion at a crucial river crossing just north of New York City. It features twin three-mile-long structures with eight traffic lanes, four emergency/breakdown lanes, a pedestrian/bike path, space for bus rapid transit, the capacity for future commuter-rail lines and will not require major maintenance for 100 years.