The Brooklyn Bridge is a bridge in New York City and is one of the oldest suspension bridges in the United States. Completed in 1883, it connects the boroughs of Manhattan and Brooklyn by spanning the East River. With a main span of 1,595.5 feet (486.3 m), it was the longest suspension bridge in the world from its opening until 1903, and the first steel-wire suspension bridge.

Originally referred to as the New York and Brooklyn Bridge and as the East River Bridge, it was dubbed the Brooklyn Bridge, a name from an earlier January 25, 1867, letter to the editor of the Brooklyn Daily Eagle,^[7] and formally so named by the city government in 1915. Since its opening, it has become an icon of New York City, and was designated a National Historic Landmark in 1964^[6][8][9] and a National Historic Civil Engineering Landmark in 1972.^[10]

The Brooklyn Bridge was initially designed by German immigrant John Augustus Roebling, who had previously designed and constructed shorter suspension bridges, such as Roebling's Delaware Aqueduct in Lackawaxen, Pennsylvania, Waco Suspension Bridge in Waco, Texas, and the John A. Roebling Suspension Bridge in Cincinnati, Ohio.

While conducting surveys for the bridge project, Roebling sustained a crush injury to his foot when a ferry pinned it against a piling. After amputation of his crushed toes he developed a tetanus infection which left him incapacitated and soon resulted in his death, not long after he had placed his 32-year-old son Washington Roebling in charge of the project.^[11] Washington Roebling also suffered a paralyzing injury as a result of decompression sickness shortly after the beginning of construction on January 3, 1870.^[12] This condition, first called "caisson disease" by the project physician Andrew Smith, afflicted many of the workers working within the caissons.^[13][14] Roebling's debilitating condition left him unable to physically supervise the construction firsthand.

Roebling conducted the entire construction from his apartment with a view of the work, designing and redesigning caissons and other equipment. He was aided by his wife Emily Warren Roebling who provided the critical written link between her husband and the engineers on site.^[15] Under her husband's guidance, Emily studied higher mathematics, the calculations of catenary curves, the strengths of materials, bridge specifications, and the intricacies of cable construction.^[16][17][18] She spent the next 11 years assisting Washington Roebling, helping to supervise the bridge's construction.

When iron probes underneath the caisson found the bedrock to be even deeper than expected, Roebling halted construction due to the increased risk of decompression sickness. He later deemed the aggregate overlying the bedrock 30 feet (9 m) below it to be firm enough to support the tower base, and construction continued.^[19] Harbor pilot Joseph Henderson was called upon as an expert seaman to determine the height of the water span of the Brooklyn Bridge.^[20]

The towers are built of limestone, granite, and Rosendale cement. The granite blocks were quarried and shaped on Vinalhaven Island, Maine, under a contract with the Bodwell Granite Company, and delivered from Maine to New York by schooner.^[21]

^{Sumber : http://en.wikipedia.org/wiki/Brooklyn_Bridge}