The New York State Thruway Authority has replaced the Tappan Zee Bridge with a new 3.1-mile state-of-the-art, twin-span bridge across the Hudson River between Rockland and Westchester counties. The $3.98 billion Governor Mario M. Cuomo Bridge is one of the largest single design-build contracts for a transportation project in the United States. Located less than 20 miles north of New York City, the cable-stayed span crosses one of the widest parts of the river and will be the largest bridge in New York State history.
The Tappan Zee Bridge opened to traffic in 1955 and, until its retirement on October 6, 2017, was a vital artery for residents, commuters, travelers and commercial traffic. Bridge traffic grew to about 140,000 vehicles per day in 2016, far more than the Tappan Zee was designed to support. Heavy traffic, narrow lanes and the lack of emergency shoulders had the potential to create unsafe driving conditions. As a result, the bridge had twice the average accident rate per mile as the rest of the 570-mile Thruway system. Hundreds of millions of dollars were spent to maintain the structure in recent years, and the cost of maintaining it for the foreseeable future rivaled the cost of the new bridge, with no improvements to current traffic conditions. The New York State Thruway Authority retired the bridge on Oct. 6, 2017, after nearly 62 years of service.