The Manhattan Bridge is a suspension bridge that crosses the East River in New York City, connecting Lower Manhattan (at Canal Street) with Brooklyn (at Flatbush Avenue Extension) on Long Island. It was the last of the three suspension bridges built across the lower East River, following the Brooklyn and the Williamsburg bridges. The bridge was opened to traffic on December 31, 1909 and was designed and built by Polish bridge engineer Ralph Modjeski with the deflection cables designed by Leon Moisseiff, who later designed the infamous original Tacoma Narrows Bridge that opened and collapsed in 1940. It has four vehicle lanes on the upper level (split between two roadways). The lower level has three lanes, four subway tracks, a walkway and a bikeway. The upper level, originally used for streetcars, has two lanes in each direction, and the lower level is one-way and has three lanes in peak direction. It once carried New York State Route 27 and later was planned to carry Interstate 478. No tolls are charged for motor vehicles to use the Manhattan Bridge.
The original pedestrian walkway on the south side of the bridge was reopened after sixty years in June 2001. It was also used by bicycles until late summer 2004, when a dedicated bicycle path was opened on the north side of the bridge, and again in 2007 while the bike lane was used for truck access during repairs to the lower motor roadway.
The neighborhood near the bridge on the Brooklyn side, once known as Fulton Landing has been gentrified and is called DUMBO, an acronym for Down Under the Manhattan Bridge Overpass.
As part of the construction of the Lower Manhattan Expressway, there were plans to make the Manhattan Bridge Interstate 178 but since this interstate would have led to a crosstown expressway and the existing Brooklyn-Queens Expressway, the FHWA said that the first digit should be even so I-478 was chosen. However, with the cancellation of I-78 through New York City, the spur was dubbed useless.
The four subway tracks on the bridge are used by the New York City Subway. On the Manhattan side, the south side tracks, used by N Q trains, connect to Canal Street on the BMT Broadway Line while the north side tracks, used by the B D trains, connect to the Chrystie Street Connection through Grand Street. On the Brooklyn side, the two pairs merge under Flatbush Avenue to a large junction with the BMT Fourth Avenue Line and BMT Brighton Line at DeKalb Avenue. For 18 years, between 1986 and 2004, one set of tracks was closed to repair structural damage.
When the bridge first opened, the tracks did not connect to any others. In 1912, the Manhattan Bridge Three Cent Line and Brooklyn and North River Railroad, two streetcar companies, began operations on those tracks until the BRT (later BMT, which also had two tracks each over the Brooklyn and Williamsburg Bridges) trackage was connected to the bridge in 1915, and the trolleys were moved to the upper level roadways until 1929, when service was discontinued.
The Brooklyn side of the tracks has not changed since subway service began on the bridge. It has always been fed by the four-track connection from the BMT Fourth Avenue Line. The Manhattan side has changed, however. When originally built, the two north tracks connected to the BMT Broadway Line (where the south tracks now connect), and the two south tracks curved south to join Chambers Street on the BMT Nassau Street Line along tracks now used for storage (and no longer connected to the bridge).
On November 26, 1931, a connection south of Chambers Street to the Montague Street Tunnel opened, adding two stations (Broad and Fulton Streets) and rerouted train service on the bridge's south side. Service on that side became relatively low afterwards as the only trains that normally crossed it were The Bankers' Special, which ran from either the Sea Beach and/or Fourth Avenue Line, crossed the Manhattan Bridge or Montague Street Tunnel into Manhattan, and then returned to Brooklyn via the opposite crossing.
Concurrent with the building of the Chrystie Street Connection (opened November 26, 1967) to connect to the north tracks, the south tracks were rerouted to the BMT Broadway Line connection, and the connecting tracks to the BMT Nassau Street Line were closed and subsequently removed. The connection opened two new stations (Grand Street and 57th Street-6th Avenue) and added express service on the IND Sixth Avenue Line. It also allowed the IND B and D trains to enter the BMT West End and Brighton Lines in southern Brooklyn, respectively. N (BMT Sea Beach Line) and Q (BMT Brighton Line) trains now use the south side of the bridge for service to Broadway.
Because tracks were on the outer part of the bridge, passing trains caused the bridge to tilt and sway. The wobble worsened as trains became longer and heavier. The New York City Department of Transportation failed to maintain the bridge properly, and the tracks finally were closed for repairs, blocking the paths of the trains that cross the bridge and reducing the number of trains passing between Manhattan and Brooklyn. The north tracks, which had been more heavily used, were closed first, from 1985 to 1988. The blockage split the B and D trains into two sections and rerouted the N via the Montague Street Tunnel. The south tracks were closed in December 1988, and except for a brief period in mid 1990, remained closed to trains until July 22, 2001, merging again the B and D trains and rerouting the Q to 6th Avenue. When the south side opened again, the north side was again closed, returning the Q to Broadway, introducing the new W line (which ran on the West End Line) and cutting B and D service from Brooklyn. On February 22, 2004, the north side reopened, and all four tracks were in service simultaneously for the first time in 18 years. B and D trains returned to Brooklyn on opposite routes (B to the Brighton Line, and D to the West End Line), the N once again uses the bridge for travel, and the W no longer runs in Brooklyn. Also, the north tracks were closed during off-peak hours between May and November 1995, and the same for the south tracks in 2003.
Construction of the Manhattan Bridge appears as a sub-plot in Jed Rubenfeld's 2006 novel The Interpretation of Murder.