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Macomb’s Dam Bridge

Posted on March 11, 2010January 25, 2016 by shayna

Crosses: Harlem River
Connects: Washington Heights, Manhattan and Grand Concourse, Bronx, NY [satellite map]
Carries: 4 vehicular lanes, 2 sidewalks
Design: swing
Date opened: May 1, 1895
Postcard view: “Viaduct 155th Street, New York City.”

Macomb’s Dam bridge crosses the Harlem River, connecting West 155th Street in Manhattan with Jerome Avenue in the Bronx, just west of Yankee Stadium.

The Dam

Sign warning of gong signaling bridge opening

The story of Macomb’s Dam Bridge dates back to 1813 when Robert Macomb, a local businessman, sought permission from the state legislature to build a dam across the Harlem River near 155th Street in Manhattan. He intended to turn the portion of the river between there and a dam he owned near King’s Bridge on Spuyten Duyvil Creek into a mill pond. The legislature granted permission for the dam on January 10, 1814, with a stipulation that a lock or some other mechanism for naval passage be built into the structure. In late 1813, when it became apparent that Macomb would be given permission to build his dam, a group of fifty prominent citizens petitioned the city’s Common Council seeking authorization for a bridge to be built on top of the dam. The petition mentioned Macomb’s approval for the idea, and an agreement to allow Macomb to charge tolls for passage over the bridge, with half of the toll money going to the city to help educate the poor. The Common Council announced the completion of the bridge on July 8, 1816, and recommended that the city build new roads in the area, which at the time was largely undeveloped, to take advantage of the new crossing.

When the dam was built, Macomb had a small lock, about 7 feet by 7 feet wide, installed on the Westchester County (encompassing what is now the Bronx) side of the structure. However, for unknown reasons, it was filled in with stone sometime in the late 1820s. For a while it was still possible for very small boats to pass through the openings between the piers supporting the bridge deck at high tide, but the trip was extremely hazardous. Several deaths were recorded when boats either overturned or broke apart during the passage.

Local citizens who had previously used the shores of the river for shipping coal, produce, and other materials began to organize an opposition to the obstruction caused by the dam. Robert Macomb had gone out of business by this point, and the ownership of the dam had passed through a number of hands. Complaints filed with the owners of the dam went nowhere, and the group enlisted the help of a young Lewis G. Morris.

The Nonpareil

Morris was of the belief that the obstruction of river navigation was illegal, so he devised a meticulous plan to reopen the river to traffic. He collected sworn statements from locals who had lived on the river before the construction of the dam, describing sloops and schooners sailing up the river to deliver cargo. Several times in early 1838, Morris took sail boats smaller than those described by the locals up the river to the dam, keeping detailed logs of the date, time, and the conditions of the water during the trip. Each time he reached the dam, he requested passage from the bridge tender. Each time, the bridge tender would turn him away, precisely as Morris expected, as such passage was impossible. On the night of September 14, 1838, Morris arranged for a shipment of coal to be delivered from Jersey City on board a boat named the Nonpareil to a dock he had built north of the dam in preparation for the plan. When the Nonpareil, with Morris aboard, reached the dam, passage through the dam was requested. Once again, the bridge tender refused to allow Morris through. When he did so, a band of about 100 men that had accompanied the Nonpareil on the last leg of her journey in an assortment of skiffs and flatboats went at the dam with shovels, axes, and other tools, tearing down a large enough section of the dam to allow Morris’ boat to pass through. When it was found that the tidal flow through the new opening was still difficult to navigate at anything but slack tide, the group returned the next week and spent three days tearing down additional sections of the dam.

Original bridge (Source: Harlem River Bridges) — Original bridge (Source: *Harlem River Bridges*)

William Renwick, the owner of the dam at the time, was furious, and attempted to have Morris arrested for disturbing the peace. When that failed, Renwick sued Morris for damages incurred to his property. In the Superior Court, Morris presented in his defense the original charter for the dam with its stipulation to allow navigation and the evidence he had collected showing that navigation, while once possible, was no longer so on account of the dam owner’s refusal. The court ruled that Morris had done nothing wrong. Renwick appealed the decision, and the Court of Errors affirmed the earlier decision. The case then went to the New York Supreme Court, where Justice J. Cowen ruled that the dam owners “have been guilty of a public nuisance” by obstructing the river with the dam. Having succeeded with his plan, Morris continued to act as an advocate for navigation and the improvement of the Harlem River, playing a major part in the construction of the High Bridge to carry the Croton Aqueduct over the river, the creation of the Harlem River Ship Canal, and other projects.

Central Bridge

After the lengthy legal battle, the owners found themselves forced to maintain an opening in the dam. This arrangement worked for a while, but increasing traffic on the river caused many to call for the complete destruction of the dam, and to have it replaced with a proper movable bridge. On April 16, 1858, the City of New York and Westchester County were directed by the state legislature to remove the dam and build a free public bridge with a turntable opening, allowing navigation of the river at any time of the day. Lewis G. Morris and Charles Bathgate, a local landowner, were appointed as commissioners to direct the project. In 1861, Central Bridge, as it was named by the city, was completed.

1861 square frame bridge (Source: Harlem River Bridges) — 1861 square swing frame bridge (Source: *Harlem River Bridges*)

Central Bridge was a wooden structure requiring frequent repairs. Large portions of the bridge had to be rebuilt entirely. The square swing frame was replaced by a wooden “A” frame in 1877. The wooden approach spans were replaced by iron spans in 1883. These repairs did not seem to help much, as an 1885 New York Times article showed. “They ought to keep it for clam wagons,” said Lawson N. Fuller, a local horse racer, “though no clam with any regard for himself would ever cross the bridge if he could help it” (A Patchwork of Wood). In October 1887, the city’s Board of Estimate and Apportionment, which controlled the city’s finances, balked at the estimated $60,000 needed to once again bring the bridge into a usable state of repair, and suggested that money would be better spent on a new bridge or a tunnel under the river. The tunnel idea was very popular with local residents who were tired of travel delays incurred by frequent bridge openings. The city elected to build a new bridge, however, and an Act of Legislature passed in 1890 authorized its construction.

Macomb’s Dam Bridge

Alfred P. Boller was chosen as the head engineer of the construction of the new bridge. Boller had a solid reputation as a structural engineer with an eye for aesthetics, which was apparent in the design he selected for the new bridge.

Macomb’s Dam Bridge is a swing bridge, with a span that rotates on a center pivot to make way for boat traffic on the river. The movable span is a 415-foot long Pratt through truss structure with a rectangular central tower adorned with decorative finials and top chords gracefully curving down to the deck with a concave profile. At the time of construction, the span was said to be the heaviest movable structure in the world. The piers that support the ends of the movable span when in the closed position are constructed of granite, with large archway openings on the bottom. On top of both ends of the piers are stone gate tender’s houses with red shingled pyramidal roofs.

The approach on the Manhattan side is composed of a V-shaped intersection, with Macombs Place, formerly Macomb’s Dam Road, on the south, and West 155th Street, carried on a large viaduct on the west. The 155th Street Viaduct was built at the same time as the bridge, and was also designed by Boller. It is 1600 feet long and about 61 feet feet wide. It is a steel structure, composed of deck girder spans carried on two parallel rows of steel columns across the valley from the heights above Harlem.

Bridge plaque reading "Central Bridge" — Bridge plaque reading “Central Bridge”

The approach on the Bronx side of the bridge is composed of two Warren deck truss spans on masonry piers, six steel girder spans installed between 1949 and 1951 with the construction of the Major Deegan Expressway, and most noticeably, a 221 foot camelback through truss carrying the roadway over the Metro-North tracks below.

Construction of the bridge began in 1892, and the old bridge was moved up the river to a set of temporary piers at 156th Street to act as an alternative crossing while the new bridge was being built. The swing span and Bronx approaches for the bridge were built by the Passaic Rolling Mill Company of Paterson, NJ. The 155th Street Viaduct was built by the Union Bridge Company of Athens, PA. The ornamental iron railings and stairways on the bridge and viaduct were made by Hecla Iron Works of Brooklyn.

The bridge opened to traffic on May 1, 1895. An announcement published in the next day’s New York Times said simply, “The new Macomb’s Dam Bridge, which crosses the Harlem River at One Hundred and Fifty-fifth Street, was opened at 9 o’clock yesterday morning. There was no particular ceremony” (New Macomb’s Dam Bridge Opened).

The official name for the new bridge was also Central Bridge, as indicated by the ornamental plaque that still exists on the western side of the swing span. That name, however, never fell into popular use, with almost all New Yorkers continuing to refer to it by its old name, Macomb’s Dam Bridge. Martin Gay, Bridge Commissioner for the city in the early 1900’s decried the Central Bridge name as being “meaningless” (1904, Harlem River Bridges). A resolution by the Board of Alderman officially renamed it as Macomb’s Dam Bridge on November 11, 1902.

Macomb's Dam Bridge from the Harlem River — Macomb’s Dam Bridge from the Harlem River

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Marine Parkway Bridge

Posted on March 8, 2011January 25, 2016 by shayna

Crosses: Rockaway Inlet in Jamaica Bay
Connects: Floyd Bennett Field, Brooklyn and the Rockaways, Queens, NY [satellite map]
Carries: 4 vehicular lanes, 1 pedestrian sidewalk
Design: vertical lift bridge
Date opened: July 3, 1937
Postcard view: “Marine Parkway Bridge, Brooklyn, N.Y.”

The Marine Parkway Bridge (also known as the Marine Parkway-Gil Hodges Memorial Bridge) is a vertical lift bridge which connects Flatbush Avenue at Floyd Bennett Field in Brooklyn with Jacob Riis Park and Fort Tilden in the Rockways in Queens.

Plans for a New Bridge: Robert Moses & The Marine Parkway Authority

Fiorello LaGuardia was narrowly elected Mayor of New York City in 1933; he would serve three terms from 1934 to 1945. LaGuardia was impressed by the parkways Robert Moses had built in Long Island (and by his ability to raise federal funds to finance them), and he immediately offered him a job in his administration. Moses had plans for parkways and parks in New York City ready to go, and he only agreed to take the job from LaGuardia if he would have control of the parks departments in all five boroughs, which had previously been independent of one another. Moses also wanted control of the parkways; LaGuardia agreed. Moses quickly took over the the Triborough Bridge Authority; that bridge’s construction had begun in 1929 but had stalled and remained incomplete. He also introduced a plan to finance construction of the Marine Parkway Bridge that called for the creation of the Marine Parkway Authority, of which, of course, Moses would be chairman and sole member. He raised money for these and other projects (which would charge tolls when they opened) by issuing bonds; when a project was complete, he would not sell off the bonds but would begin another toll-collecting project, continuing the cycle.

Opposition

Moses issued $6,000,000 in bonds in order to build the Marine Parkway Bridge, and it was expected that within 25 years, through toll collection the bridge would pay for the loan and allow the bridge to be self-sustaining. However, there was plenty of opposition to the bridge proposal. The surrounding communities had been served by ferries and many people did not want to see that change. There were others who felt that Jamaica Bay might one day become a major port and the building of a bridge would destroy that potential. So, more than $18 million was spent by the U.S. War Department to dredge Rockaway Inlet and the bridge was designed to be a lift span, to enable the channel to remain clear for ship traffic. There was also the issue of ice: it was feared that ice would pile up on the bridge piers and either block passage or cause the surrounding areas to flood, sweeping cottages along Rockaway Beach out to sea. The solution was to bring in a forest of 600-foot-tall Douglas fir trees from the west coast to be driven into the sand and act as fenders against the ice around the bridge’s piers.

Marine Parkway Bridge, seen from Floyd Bennett Field

The Barren Island Squatters

Another problem encountered before construction of the bridge could begin was a well-established colony of squatters living on what formerly was known as Barren Island. Barren Island was a roughly three mile long and one mile wide stretch in the southern Brooklyn section of Jamaica Bay. In the late 1800s, the land at either end of the island the island was home to several putrid-smelling industries including fish, fat, and offal rendering plants and another that rendered horse bones into glue, leading to the the body of water on the island’s western shore’s name: Dead Horse Bay. About 120 acres in the center of the island was owned by the city, intended to be used as a dumping ground. However, due to the city’s neglect, the land was taken over by a colony of squatters, who by 1877 numbered around 100. The squatters kept livestock such as goats and pigs, and even set up a liquor saloon on the island. The stench of the rendering plants grew worse and worse, and after years of complaints from Brooklyn residents, the plants were required to dump their refuse at sea. The Brooklyn Daily Eagle described the situation in 1899 as being “improved:”

Nowadays the ancient cheeses, the butchers’ offal, the long-deceased animals, the contents of refuse cans and barrels are not piled along the waterfront… On the contrary, the process is quick and thorough. Deodorizing substances are freely used in the materials that are disgorged from New York’s thousands of kitchens and butcher shops. The sufferings that are reported in various parts of Brooklyn and along the south shore probably result in larger measure than the people realize from the dumping which is still carried on at sea, the scows going out six or eight miles, instead of the required forty, and throwing overboard tons of swill that the incoming tide washes upon the shored of Coney Island, Rockaway and even Long Beach. This vile stuff festers in the sun, sours and breeds maggots and flies by millions. [1]

Despite many attempts over the years to remove the squatters, they stayed put. Barren Island was connected to the Brooklyn mainland with landfill during the construction of Floyd Bennett Field (New York City’s first municipal airport), which opened in 1931. By then the rendering plants were long gone, but the squatters still remained. In 1936, Robert Moses, as Park Commissioner, called for their eviction; at that time there were an estimated 90 squatters (and their livestock) still living on the former island. They were given until April 15, 1936 to vacate, and Alderman Joseph B. Whitty of Brooklyn was granted a promise by Mayor LaGuardia that the houses on the island would be treated as “condemned tenements” [2], so that the squatters would be provided with free moving service as they left the island. In August of the same year, five acres of marijuana plants were discovered on the island, upon which the goats the squatters had kept had been grazing. The squatters, when questioned, denied that there was any other intended use for the plants.

Engineering

Moses the planner had engineers ready to work on the Marine Parkway Bridge. The chief engineer on the project was Rensselaer Polytechnic Institute graduate Emil H. Praeger (who worked on numerous projects for the Parks system and went on to design the Tappan Zee Bridge). The firm of Madigan-Hyland were also involved as engineers. Robinson & Steinman were hired as consultants; Holton D. Robinson was the engineer of the Williamsburg Bridge and David Steinman designed the Henry Hudson Bridge as his thesis while at Columbia University. The title of Engineering Designer was filled by the esteemed Waddell & Hardesty, formed in 1927. Also both Rensselaer graduates, the firm of J.A.L. Waddell and Shortridge Hardesty was known for its movable bridge designs, especially vertical lift spans. The contractors awarded the bids for construction of the bridge were the Frederic Snare Corporation and the American Bridge Company.

Construction & Design

Construction began on June 1, 1936. A method differing from usual lift bridge construction was used, where instead of floating the lift span in at the very end, it was placed partway through, planned to coincide with a particularly high tide. Just after midnight on January 12, 1937, 38 workmen from the American Bridge Company began the operation; tugboats guided the central span along and at 7:45 a.m., while the tide was at its highest, it was placed into position. The partially built towers had a special trestle attached to their foundations from which the towers would be completed.

The bridge is designed of three main 540-foot spans, each allowing for a 500-foot clear channel. There are two 1,061-foot approaches; its total length is 4,022 feet, 6 inches. The 2,000-ton central span could be raised from 50 feet to a total clearance of 150 feet above the high water mark in two minutes. When it was completed it was the longest highway lift bridge in the world (it is still the longest of its type in North America), built of 12,000 tons of steel and 47,000 cubic yards of concrete. The bridge was painted olive green with silver trim. The roadway, instead of being solid, was built of steel plates, similar to subway gratings set in sidewalks throughout the city. It was the first roadway of this type to be used on a bridge on the East Coast. The open grates were also painted green.

One complaint about vertical lift bridges at the time was that their appearance could be ugly; often they were employed by railroads and were decidedly utilitarian in design. In response to this, the towers of the Marine Parkway Bridge were tapered and a pattern designed to hint at the great wheels that lifted the bridge rather than hiding them [3]. Construction was finished less than a year after it began, and the bridge was scheduled to open in July, in time for motorists to enjoy the summer in the new Jacob Riis Park.

Opening Ceremony

The bridge officially opened on July 3, 1937. The ceremony was headed by Mayor LaGuardia who was joined by Park Commissioner Robert Moses and various other city officials. 500 cars full of invited guests waited on the Brooklyn side of the bridge, on the approach built on Barren Island. Guns were fired from Fort Tilden, fireboats sprayed water into the air, and nine Martin planes flew in formation overhead. The center span was lowered for traffic and at 10:30 a.m. a parade of cars began to cross the bridge to Jacob Riis Park, where Moses gave a speech detailing the planning that had led up to the building of the bridge. It was given recognition in the engineering world as well: The National Steel Bridge Alliance awarded it first place in the movable bridge category in 1937.

Renaming & Rehabilitation

The bridge was renamed in 1978 in honor of Gil Hodges, a former Brooklyn Dodgers first baseman, though the name has not taken into common usage [4]. The Marine Parkway Authority was absorbed into the larger Triborough Bridge Authority in 1940 (becoming he Triborough Bridge and Tunnel Authority in 1946). Traffic and toll collection on the Marine Parkway Bridge did not turn out to be enough to pay for its own expenses, but other bridges and tunnels run by the TBTA were profitable enough to carry those that were less so. The TBTA is now under the jurisdiction of the MTA, who began a major rehabilitation project on the bridge in 1998. The steel deck was replaced with concrete and steel, a “Jersey” barrier was added to separate traffic, electrical systems and traffic control were updated, and new signs were put in place. The $120 million project was finished in 2004; the bridge still opens more than 100 times a year.

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Roosevelt Avenue Bridge

Posted on February 8, 2010March 2, 2016 by shayna

Crosses: Flushing River
Connects: Corona and Flushing, Queens, NY [satellite map]
Carries: 4 vehicular lanes, 2 sidewalks, IRT 7 subway
Design: double-leaf bascule
Date opened: May 14, 1927

The Roosevelt Avenue Bridge is a double-deck, double-leaf bascule movable bridge over the Flushing River in northeastern Queens. It carries four lanes of Roosevelt Avenue and two sidewalks on its lower deck, and three tracks of the IRT Flushing / 7 train line of the New York City Subway on its top.

Planning

Surveying for the bridge began in 1913 as part of an extension of the Interborough Rapid Transit Company’s Woodside and Corona line. The original plan had the line mapped out between 42nd Street in Manhattan and Prime Street in Corona, with the extension reaching out to the village of Flushing, with a possible further extension to Little Neck at the city line. The line reached Corona in 1917, but United States involvement in World War I prevented further construction. Financial problems after the war delayed progress still until 1921, when city engineers began negotiations with the US War Department concerning what type of structure the city could build to cross the Flushing River. The War Department, which had jurisdiction over all navigable waterways and their crossings in the country at that time, denied a request by the city to be allowed to build a simple fixed bridge across the river on account of it being an obstruction to river traffic. A tunnel was briefly considered, but was decided against when cost estimates for it reached $2,500,000, more than the city was willing to pay. The War Department suggested the city build a bascule bridge, and officials relented.

Construction

Groundbreaking for the bridge was held on April 21, 1923 in a ceremony attended by Mayor John Hylan and Maurice E. Connolly, Borough President of Queens. Construction began soon after, though many delays occurred due to a recurring problem with the foundations of the bridge settling in the deep mud on the banks of the river. On May 14, 1927, the bridge was opened to pedestrians and a bus line was established between downtown Flushing and Willet’s Point Boulevard station, the temporary terminal of the line while the foundation issues were being resolved. Train service would not begin across the bridge until January 21, 1928, with a special train for city officials making the inaugural run from Time Square to the new station in Flushing. The extension to Little Neck has yet to be built.

view from the walkway — Roadway and sign

The final cost of the bridge was $2,640,000, more than the estimated cost of a tunnel under the river, even when adjusted for inflation. Despite the additional cost the city was required to pay for a movable bridge, the need to keep the river open to navigation did not last long. When construction of Flushing Meadows Park was under way in 1939, park engineers realized a dam was needed to keep the tides of the East River from inundating the low-lying fields. The Long Island Railroad, which runs just a few hundred feet upriver from Roosevelt Avenue, agreed to replace the swing bridge they owned over the river with a combined embankment and tidal gate on top of which they would continue to operate their trains. With no docking facilities in place between the two structures, navigation of the Flushing River effectively ended at the Roosevelt Avenue bridge. In 1961, construction of the northern extension of the Van Wyck Expressway began, and the route of the highway was driven directly through the navigation channel of the bridge, supported over the river by concrete piers. The operating mechanisms and bridge tender’s controls were finally removed at that point, and the bridge has not opened since.

Design

The Roosevelt Avenue bridge was the largest trunnion bascule bridge in the world when it was completed. It was designed by Edward A. Byrne and Robert E. Hawley of the NYC Department of Plants and Structures, and built by the Arthur McMullen Company of New York. The channel of the river at the point of the bridge is only 70 feet wide, but because of the skew of the route over the river, the clearance between the bridge piers is 162 feet. Together, the lift leaves are 153 feet long, and each weighs approximately 4 million pounds, supported by a truss structure 25 feet 6 inches deep. The piers that support the leaves are of poured concrete construction, with granite blocks covering the facings exposed to the water. Each pier measures 92 feet by 118 feet, and contains a large hollow space inside to accommodate the movement of the bridge’s counterweights.

Future

In January, 2010, the NYC Department of Transportation announced plans to rehabilitate the bridge starting in 2012. Years of neglect have resulted in a need to replace the road deck, repaint and repair rust on the steel truss and approach structures, and repair deteriorating concrete. The city also plans widen the sidewalks from 8 to 10 feet and establish bike lanes within them. The project is expected to be finished in 2015.

Update (04/29/2015): Rehabilitation has been delayed and is now expected to begin in mid-2015 with an end date to be determined.

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Third Avenue Bridge

Posted on August 24, 2010January 25, 2016 by shayna

Crosses: Harlem River
Connects: Third Avenue between Mott Haven, the Bronx and Harlem, NY [satellite map]
Carries: 5 Manahattan-bound vehicular lanes, 2 pedestrian sidewalks
Design: swing bridge
Date opened: 2004
Postcard view: “Harlem River, N.Y. City”

The Third Avenue Bridge is a swing bridge over the Harlem River, connecting Third Avenue in Manhattan with Third Avenue in the Bronx. It is the fourth bridge to stand at that location.

In 1774, Lewis Morris received permission to build a bridge to connect a proposed road through Harlem with a road leading to the Morris family’s estate, Morrisania, and the village of Eastchester (both are now neighborhoods located in the Bronx). Though a ferry had once operated between Manhattan and the Bronx just east of the proposed site of the crossing for a few years in the late 1600s, the only way for people to travel between the two at the time of Morris’ proposal was by either King’s Bridge or Farmer’s Bridge, both of which were located at the far northern tip of Manhattan. Morris’ bridge would cut the traveling distance between his estate and the southern end of Manhattan, the core of the city at the time, by nearly 12 miles.

Coles Bridge

Nothing was done about the bridge, however, until the end of March 1790, when a refined charter was given to Morris to build a drawbridge at least 12 feet wide to accommodate river traffic. Morris was also given permission to charge tolls on the bridge for a period of 60 years, after which ownership of the bridge would pass on to the state. Such arrangements were common at the time as an enticement for private entities and individuals to invest in public infrastructure.

Also common at the time were delays concerning large projects such as this. Nothing concerning the bridge is mentioned in the city’s legislative archives until March 1795, when Morris sought permission to transfer his charter to a business partner and family friend named John B. Coles. The new charter was approved with a modification allowing Coles to build the bridge on top of a dam in order to a establish a water-powered mill at the site. In early 1797 the Coles Bridge, as it came to be known, a simple wooden structure with a turntable draw span, was opened, though Coles apparently never got around to building a dam underneath it. The route over the bridge, consisting of a newly constructed Middle Road (now roughly Eighth Avenue and Central Park West) in Manhattan and what came to be known as Coles Road (now Third Avenue and Boston Post Road in the Bronx) quickly became more popular than the King’s Bridge or Farmer’s Bridge route, in spite of the fact that Coles had inherited and taken advantage of Morris’ right to charge tolls while the uptown crossings were both free to use.

The Harlem Bridge

On April 1, 1858, in accordance with the original charter’s stipulation and the State Legislature’s Chapter 774 of the Laws of 1857, ownership of Coles Bridge passed from the Coles family to the state government. By that time, the bridge had fallen into such a bad state of repair that nothing could be done to save it, according to the Commissioners of Harlem Bridge, a group consisting of New York and Westchester officials convened specially to oversee the takeover of the bridge by the state. In June 1860, the Commissioners made an official inspection of the bridge in anticipation of a reconstruction project. They found the superstructure in an advanced state of decay and “the piers destroyed by the ravages of the worm” [1] (the worm in question, teredo navalis, is not actually a worm but a mollusk, commonly known as the shipworm or marine borer. It is still a serious problem in the city, with many millions of dollars budgeted for the reconstruction of waterfront piers, highways, and high rise foundations due to its highly efficient method of consuming submerged wooden pilings).

The official decision to rebuild the bridge came soon after, and work began in August 1860. Erastus W. Smith, a New York mechanical engineer with many years of experience running municipal water works and ocean liner systems was named as Chief Engineer of the project. The original plans for the bridge called for a series of simple through truss approach spans with a through truss swing span atop a turntable. Smith decided instead to build the bridge with arched tubular truss spans constructed of wrought iron, giving the bridge a gracefully curved profile in comparison to the original boxy design. The old span was kept in place as the new bridge was built just west of it. The piers for the new bridge consisted of a combination of six foot and eight foot diameter cast iron cylinders, sunk into the river bed by pneumatic force, one of the earliest instances of the use of compressed air for bridge construction in the country. The pier sinking and foundation work were completed by the New York firm of Roach & Edwards. The superstructure of the bridge was constructed by the Trenton Locomotive Machine Manufacturing Company of New Jersey. After 8 years of work, the still incomplete bridge, called the Harlem Bridge, was opened for public use on October 16, 1868. The bridge measured 526 feet long by 52 feet wide, including a 218 foot long swing span that operated under the force of water supplied by a Croton water main. Shortly after it opened, a horse car railroad was established over the bridge by the Harlem Bridge, Morrisania and Fordham Railroad Company. Horses would be used on the bridge until 1891, when they were replaced by a an electric propulsion system with power provided by overhead wires.

The Third Avenue Bridge

The Harlem Bridge did not last long, however. After several years, parts of the bridge began to fall apart. The cast iron piers began to crack and the wheels under the turntable had to be replaced multiple times after breaking into pieces. The water powered engine was found to be too sluggish to keep up with the demands of road and river traffic and had to be replaced with a steam engine. In 1882, jurisdiction over all underwater land surrounding the city passed on to the US Government, which had plans to improve the waterways of the city. in 1890, the government passed the Rivers and Harbors Act which specified, among other changes, that all bridges over the Harlem River be raised in order to provide 24 feet of clearance above high water. The Harlem Bridge only provided 5 feet of clearance over the river. Shortly after, the city’s Department of Public Works, which had jurisdiction over the bridge at the time, brought forth a bill in the state legislature asking for authorization to replace the bridge with one that would comply with the new law. The bill was approved, and authorization came in the form of Chapter 413 of the Laws of 1892.

Third Avenue Bridge (Source: Report of the Commissioner of Bridges, 1904) — Third Avenue Bridge (Source: *Report of the Commissioner of Bridges, 1904*)

The Harlem Bridge was closed on June 20, 1894, with traffic diverted to a temporary bridge while the new Third Avenue Bridge, as it would be called, was being built. The new span was constructed as a swing bridge, with a swing span operating under steam power. The span was made with steel provided by the Phoenix Iron Works Company of Phoenixville, Pennsylvania. The span was 300 feet long and was composed of a large through truss structure with curved upper chords terminating at a sharp apex. It was designed by Thomas C. Clarke, the consulting engineer assigned to the project by the Department of Public Works. It was opened on August 1, 1898 with the blowing of its warning whistle, which was soon joined in by the blowing of whistles from nearby boats, trains and factories. It was the largest and heaviest bridge of its type in the world at the time. The bridge had room for two walkways and a roadway containing two sets of trolley tracks laid down by the Union Railway Company, the successor to the Harlem Bridge, Fordham and Morrisania Railway Company during the construction of the bridge. The tracks would remain in place until 1953 when the Third Avenue Elevated train line was demolished. The tracks were then converted into automobile lanes.

Replacement

The Third Avenue Bridge served the city well until the night of November 7, 1999, when a two alarm fire broke out on the wooden fender surrounding the swing span, closing the bridge for several days. in 2001, the city Department of Transportation, which now has jurisdiction over the bridge, began a $119 million reconstruction of the Third Avenue Bridge as part of a nearly $1 billion program to rehabilitate or replace all of the movable Harlem River Bridges. The new bridge, a swing span like all of its ancestors, was designed to visually mimic as closely as possible the span it replaced, albeit with more modern construction techniques and materials. It carries two sidewalks and five lanes of Manhattan-bound traffic. It opened in 2004.

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