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43-829: The Governor Malcolm Wilson Tappan Zee Bridge , commonly known as the Tappan Zee Bridge , was a cantilever bridge in the U.S. state of New York . It was built from 1952 to 1955 to cross the Hudson River at one of its widest points, 25 miles (40 km) north of Midtown Manhattan , from South Nyack to Tarrytown . As an integral conduit within the New York Metropolitan Area , the bridge connected South Nyack in Rockland County with Tarrytown in Westchester County in

86-664: A cantilever bridge. The Forth Bridge is a notable example of an early cantilever bridge. This bridge held the record for longest span in the world for twenty-nine years until it was surpassed by the Quebec Bridge . The engineers responsible for the bridge, Sir Benjamin Baker and Sir John Fowler , demonstrated the structural principles of the suspended span cantilever by sitting in chairs and supporting their colleague, Kaichi Watanabe , in between them, using just their arms and wooden poles. The suspended span, where Watanabe sits,

129-532: A pin, usually after forcing the union point apart, and when jacks are removed and the bridge decking is added the bridge becomes a truss arch bridge . Such unsupported construction is only possible where appropriate rock is available to support the tension in the upper chord of the span during construction, usually limiting this method to the spanning of narrow canyons. World's longest cantilever bridges (by longest span): Alfred E. Driscoll Alfred Eastlack Driscoll (October 25, 1902 – March 9, 1975)

172-611: A rail line across the new bridge or building the new bridge so a new rail line can be installed at a future date. Commuter rail service west of the bridge in Rockland County is limited, and the MTA studied expansion possibilities in Rockland County that would use the new bridge to connect with Metro-North's Hudson Line on the east side of the bridge along the Hudson River for direct service into Manhattan. On September 26, 2008, New York state officials announced their plan to replace

215-453: A replacement bridge at a cost of at least $ 4 billion. All traffic was shifted to the new bridge on October 6, 2017, and demolition of the old bridge began soon afterward. The eastern half of the bridge was demolished in a controlled demolition on January 15, 2019, while the western half was lowered onto a barge and hauled away in May 2019. The Tappan Zee is named for an American Indian tribe from

258-509: A site in southern Dobbs Ferry or northern Hastings-on-Hudson , where the Hudson narrowed considerably from its three-mile (5 km) width at Tappan Zee, would be a more appropriate site, and suggested that Governor Dewey work with his counterpart, Governor of New Jersey Alfred E. Driscoll , to craft a compromise that would offer Thruway customers a discounted bridge fare at a more southerly crossing. Two days later, Governor Dewey announced that

301-505: Is formed by two cantilever arms extending from opposite sides of an obstacle to be crossed, meeting at the center. In a common variant, the suspended span , the cantilever arms do not meet in the center; instead, they support a central truss bridge which rests on the ends of the cantilever arms. The suspended span may be built off-site and lifted into place, or constructed in place using special travelling supports. A common way to construct steel truss and prestressed concrete cantilever spans

344-424: Is in the center. The wooden poles resist the compression of the lower chord , while the outstretched arms support the tension of the upper chord. The placement of the brick counterweights demonstrates the action of the outer foundations. Cantilever Bridge.—A structure at least one portion of which acts as an anchorage for sustaining another portion which extends beyond the supporting pier. A simple cantilever span

387-405: Is to counterbalance each cantilever arm with another cantilever arm projecting the opposite direction, forming a balanced cantilever ; when they attach to a solid foundation, the counterbalancing arms are called anchor arms . Thus, in a bridge built on two foundation piers, there are four cantilever arms: two which span the obstacle, and two anchor arms that extend away from the obstacle. Because of

430-712: The Lower Hudson Valley . Opened on December 15, 1955, the Tappan Zee Bridge was one of the primary crossings of the Hudson River north of New York City ; it carried much of the traffic between southern New England and points west of the Hudson. The bridge was the longest bridge in New York State, a title retained by its replacement . The total length of the bridge approached 16,013 feet (3.0328 mi; 4,881 m). The cantilever span

473-651: The New York State Thruway across Westchester to the New England Thruway . The Port Authority promised its bondholders that it would not allow any other entity to construct a river crossing within its jurisdiction, which reached to a point one mile (1.6 km) south of Nyack on the western shore of the Hudson River and across to Tarrytown on the eastern shore. A May 10, 1950, editorial in The New York Times suggested that

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516-547: The Niagara Cantilever Bridge by Charles Conrad Schneider (1883) and the Poughkeepsie Bridge by John Francis O'Rourke and Pomeroy P. Dickinson (1889) were all important early uses of the cantilever design. The Kentucky River Bridge spanned a gorge that was 275 feet (84 metres) deep and took full advantage of the fact that falsework, or temporary support, is not needed for the main span of

559-747: The 1952 convention. Driscoll, a Republican , gave William J. Brennan Jr. , a Democrat , his first judicial appointment in 1949, when he appointed him to a seat on the New Jersey Superior Court . In 1951, Driscoll promoted Brennan to the Supreme Court of New Jersey , where he served until appointed to the Supreme Court of the United States by President Dwight D. Eisenhower in 1956. Driscoll died on March 9, 1975, at his home in Haddonfield, New Jersey. Although he

602-773: The Garden State Parkway across the Raritan River was named in his honor, and a failed planned extension of the New Jersey Turnpike , similar in nature to the Pennsylvania Turnpike 's Northeast Extension, would have also borne his name. Driscoll served as a delegate to the Republican National Convention from New Jersey in 1948 and 1952 , and he was considered for the vice presidential nomination at

645-634: The New York State Thruway Authority. On August 31, 2007, NYSTA officials added four phones – two each on the Rockland and Westchester sides – that connect callers via the National Suicide Prevention Lifeline crisis hotline to counselors at LifeNet or Covenant House . Signs reading "Life is Worth Living" and "When it seems like there is no hope, there is help" were placed on

688-530: The Port Authority had dropped its plans to construct a bridge of its own, and that the bridge's location would be close to the Tarrytown-Nyack line, just outside the Port Authority's jurisdiction. Dewey stated that World War II military technology would be used in the bridge's construction. The site of the bridge, at the Hudson River's second-widest point, added to construction costs. The site

731-534: The Tappan Zee Bridge with a new bridge that included high-speed bus lanes and space for future commuter-train tracks. The bridge was estimated to cost $ 6.4 billion, while adding bus lanes from Suffern to Port Chester was estimated to cost an additional $ 2.9 billion. Adding a rail line from the Suffern Metro-North station and across the bridge, connecting with Metro-North’s Hudson Line south of Tarrytown , would have added another $ 6.7 billion. The plan

774-622: The Tappan Zee was designed to last only 50 years due to material shortages during the Korean War at the time of its construction. In total, the bridge was open for 61 years, 9 months, and 21 days. The new bridge is intended to last at least 100 years without any major repairs. The collapse of Minnesota's I-35W Mississippi River bridge in 2007 raised worries about the Tappan Zee's structural integrity. These concerns, together with traffic overcapacity and increased maintenance costs, escalated

817-532: The area called " Tappan "; and zee being the Dutch word for "sea". With the increasing demands for commuter travel taxing the existing bridges and tunnels, the Port Authority of New York and New Jersey had plans in 1950 to construct a bridge across the Hudson near Dobbs Ferry, New York . The proposal was overridden by New York State Governor Thomas E. Dewey , who wanted to construct a bridge to connect

860-492: The bridge opened to traffic on December 15, 1955, along with a 27-mile (43 km) long section of the New York State Thruway from Suffern to Yonkers . The bridge was built on a very tight budget of $ 81 million (1950 dollars), or $ 1.08 billion in 2024 dollars. New York State Governor W. Averell Harriman signed a bill on February 28, 1956, to officially name the structure the Tappan Zee Bridge. In 1960,

903-445: The bridge to her death in 2010. Cantilever bridge The steel truss cantilever bridge was a major engineering breakthrough when first put into practice, as it can span distances of over 1,500 feet (450 m), and can be more easily constructed at difficult crossings by virtue of using little or no falsework . Engineers in the 19th century understood that a bridge that was continuous across multiple supports would distribute

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946-456: The bridge was not built with a plan that was "conducive to long-term durability” and that the Tappan Zee’s engineers designed it to be “nonredundant,” meaning that one "critical fracture could make the bridge fail completely because its supports couldn’t transfer the structure’s load to other supports." The Metropolitan Transportation Authority (MTA) studied the feasibility of either including

989-483: The bridge was redecked, additionally, it was given a new metallic safety barrier. Originally, tolls were collected in both directions. In August 1970, the toll was abolished for westbound drivers, and at the same time, eastbound drivers saw their tolls doubled. The tolls of eleven other New York–New Jersey and Hudson River crossings along a 130-mile (210 km) stretch, from the Outerbridge Crossing in

1032-502: The bridge, which has been called "one of the most decrepit and potentially dangerous bridges" in the U.S. Engineering assessments have determined that "everything from steel corrosion to earthquakes to maritime accidents could cause major, perhaps catastrophic, damage to the span," prompting one of the top aides in the New York state governor's office to refer to the Tappan Zee as the “hold-your-breath bridge.” A 2009 state report noted that

1075-766: The bridge. Suicide fencing and traffic cameras were also installed along the bridge, and bridge staff were trained in suicide prevention. On October 14, 2012, Newsday reported that the Tappan Zee Bridge was called the Golden Gate Bridge of the East and that the " new Tappan Zee , which is in the works, will include fencing designed to thwart jumpers." Suicides on the Tappan Zee Bridge included those of Scott Douglas on January 6th, 1994 – after murdering his wife, newspaper heiress Anne Scripps – and of Douglas's stepdaughter Anne Morrell Petrillo, who jumped to her death on September 24, 2009. A US military employee jumped from

1118-536: The forces and stresses with a hinge in the girder. Heinrich Gerber was one of the engineers to obtain a patent for a hinged girder (1866) and is recognized as the first to build one. The Hassfurt Bridge over the Main river in Germany with a central span of 124 feet (38 metres) was completed in 1867 and is recognized as the first modern cantilever bridge. The High Bridge of Kentucky by C. Shaler Smith (1877),

1161-550: The governor's office in December 1974. However, it was almost never used when the bridge was spoken about colloquially. The bridge was refurbished in 2008. It was redecked in 2010. Since the end of the 20th century, calls to replace the aging Tappan Zee Bridge had gone unanswered. The deteriorating structure bore an average of 138,000 vehicles per day by the end of its life, substantially more traffic than its designed capacity. Unlike other major bridges in metropolitan New York ,

1204-442: The loads among them. This would result in lower stresses in the girder or truss and meant that longer spans could be built. Several 19th-century engineers patented continuous bridges with hinge points mid-span. The use of a hinge in the multi-span system presented the advantages of a statically determinate system and of a bridge that could handle differential settlement of the foundations. Engineers could more easily calculate

1247-647: The loads and helped reduce costs. The bridge was designed by Emil Praeger of the Madigan-Hyland engineering firm. Captain Praeger helped develop floating caissons during World War II when the Allied forces needed to create and protect portable harbors for the 1944 invasion of Normandy . Black architect and engineer Donald F. White had also worked on the bridge design. Construction started in March 1952 and

1290-411: The need for more strength at the balanced cantilever's supports, the bridge superstructure often takes the form of towers above the foundation piers. The Commodore Barry Bridge is an example of this type of cantilever bridge. Steel truss cantilevers support loads by tension of the upper members and compression of the lower ones. Commonly, the structure distributes the tension via the anchor arms to

1333-472: The old bridge recently as part of emergency repairs would be sold to local governments for a dollar each so that local governments can build new bridges. Other parts of the old bridge would be sunk off the Atlantic Ocean coast as part of New York State's artificial reef program. In May 2018, the state government began sinking parts of the old bridge to make 12 artificial reefs. On January 2, 2019, it

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1376-444: The opening of the new eastbound span was delayed when a piece of the old bridge came loose on September 7 while being demolished. The eastbound span, which was 160 feet (49 m) away from the old bridge, remained closed until the old bridge could be stabilized. The old bridge was then demolished in piecemeal fashion in order to minimize impacts on the Hudson River's wildlife and marine traffic. 135 deck panels that were assembled onto

1419-609: The outermost supports, while the compression is carried to the foundations beneath the central towers. Many truss cantilever bridges use pinned joints and are therefore statically determinate with no members carrying mixed loads. Prestressed concrete balanced cantilever bridges are often built using segmental construction . Some steel arch bridges (such as the Navajo Bridge ) are built using pure cantilever spans from each side, with neither falsework below nor temporary supporting towers and cables above. These are then joined with

1462-469: The serious discussions already ongoing about replacing the Tappan Zee with a tunnel or a new bridge. Six options were identified and submitted for project study and environmental review. In 2009, the Tappan Zee Bridge was featured on The History Channel "The Crumbling of America" showing the infrastructure crisis in the United States . Many factors contribute to the precarious infrastructure of

1505-478: The south to the Rip Van Winkle Bridge in the north, were also changed to eastbound-only at that time. In an effort to reduce congestion, the median was replaced by a seventh travel lane in 1987, this meant making the other six lanes narrower. A zipper barrier was installed in 1992. In 1994, the name of Malcolm Wilson was added to the bridge's name upon the 20th anniversary of his leaving

1548-446: Was 1,212 feet (369 m), which provided a maximum clearance of 138 feet (42 m) over the water. The bridge was officially named after former governor Malcolm Wilson in 1994, though the original name continued to be used. The Tappan Zee Bridge was part of the New York State Thruway mainline and carried the highway concurrency of Interstate 87 and Interstate 287 . The span carried seven lanes of motor traffic. The center lane

1591-443: Was able to be switched between eastbound and westbound traffic depending on the prevalent commuter direction; on weekdays the center lane was eastbound in the morning and westbound in the evening. The switch was accomplished via a movable center barrier which was moved by a pair of barrier transfer machines . Even with the switchable lane, traffic was frequently very slow. In 2013, federal and state authorities started constructing

1634-669: Was an American Republican Party politician, who served in the New Jersey Senate (1939–1941) representing Camden County , who served as the 43rd governor of New Jersey , and as president of Warner-Lambert (now a part of Pfizer ). Driscoll was born on October 25, 1902, in Pittsburgh , Pennsylvania. He grew up in Haddonfield, New Jersey , and graduated from Haddonfield Memorial High School in 1921. He attended Williams College , where he graduated in 1925. In 1928, he

1677-404: Was announced that the eastern approach to the old bridge would be demolished with explosives on January 12. However, it was postponed due to high winds. It was demolished on January 15, 2019. The western approach was lowered onto a barge and hauled away beginning on May 12, 2019 and lasting several days. From 1998 to 2008, more than 25 people committed suicide on the Tappan Zee Bridge, according to

1720-471: Was awarded an LL.B. degree from Harvard University . He served as Governor of New Jersey from 1947 to 1954 where he was a proponent for the New Jersey Turnpike and the Garden State Parkway . From the time of their construction, these two major transportation links would transform the agrarian "Garden State" into the most densely populated state in the union. The Driscoll Bridge on

1763-436: Was chosen to be as close as possible to New York City, while staying out of the 25-mile (40 km) range of the Port Authority's influence, thus ensuring that revenue from collected tolls would go to the newly created New York State Thruway Authority , and not the Port Authority. A unique aspect of the design of the bridge was that the main span was supported by eight hollow concrete caissons . Their buoyancy supported some of

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1806-512: Was reviewed for its environmental impacts. In 2013, the New York State Thruway Authority began building the new Tappan Zee Bridge , a double-span bridge (four lanes per span in opposite directions) with designated bus lanes, to the north of the old bridge. Construction began as scheduled during 2013, with completion projected for 2017. The new northbound/westbound span opened on August 25, 2017. The zipper barrier

1849-451: Was then removed, and nouthbound/eastbound traffic remained on the old span until October 7, 2017, when it was temporarily shifted to the newer northbound/westbound span. The old bridge was subsequently decommissioned. The replacement bridge project was expected to be completed by June 15, 2018 at a cost of $ 3.98 billion. After some delays, it was announced that the new southbound/eastbound span would open to traffic on September 8, 2018. However,

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