The maps and pictures further below illustrate material related to Queensboro Bridge. The Queensboro Bridge, also known as the 59th Street Bridge – because its Manhattan end is located between 59th and 60th Streets – and officially titled the Ed Koch Queensboro Bridge, is a cantilever bridge over the East River in New York City that was completed in 1909. It connects the neighborhood of Long Island City in the borough of Queens with Manhattan, passing over Roosevelt Island. It carries New York State Route 25 and is the westernmost of the four East River spans that carry a route number: NY 25 terminates at the west (Manhattan) side of the bridge, which once carried NY 24 and NY 25A as well. The bridge is flanked on its northern side by the freestanding Roosevelt Island Tramway.
Serious proposals for a bridge linking Manhattan to Long Island City were first made as early as 1838 and attempts to finance such a bridge were made by a private company beginning in 1867. Its efforts never came to fruition and the company went bankrupt in the 1890s. Successful plans finally came about in 1903 under the city's new Department of Bridges, led by Gustav Lindenthal (who was appointed to the new position of Commissioner of Bridges in 1902), in collaboration with Leffert L. Buck and Henry Hornbostel, designers of the Williamsburg Bridge.
Construction soon began, but it would take until 1909 for the bridge to be completed due to delays from the collapse of an incomplete span during a windstorm and from labor unrest (including an attempt to dynamite one span). The bridge opened to the public on March 30, 1909, having cost about $18 million and 50 lives. A ceremonial grand opening was held on June 12, 1909. It was then known as the Blackwell's Island Bridge, from an earlier name for Roosevelt Island. Between 1930 and 1955, there was a vehicular elevator to transport cars and passengers to and from Welfare Island, now known as Roosevelt Island. This was demolished in 1970.
The Queensboro Bridge is a double cantilever bridge, as it has two cantilever spans, one over the channel on each side of Roosevelt Island. The bridge does not have suspended spans, so the cantilever arm from each side reaches to the midpoint of the span. The lengths of its five spans and approaches are as follows:
- Manhattan to Roosevelt Island span length (cantilever):
- Roosevelt Island span length:
- Roosevelt Island to Queens span length (cantilever):
- Side span lengths:
- Total length between anchorages:
- Total length including approaches: