The Third Avenue Bridge carries southbound road traffic on Third Avenue over the Harlem River, connecting the boroughs of Manhattan and the Bronx in New York City. It once carried southbound New York State Route 1A. The Third Avenue Bridge carries traffic south from Third Avenue, East 135th Street, Bruckner Boulevard, and Lincoln Avenue in the Bronx, to East 128th Street, East 129th Street, Lexington Avenue, and the Harlem River Drive in Manhattan, traveling over the Metro-North Railroad Oak Point Link, the Harlem River, and Harlem River Drive.
As part of a major reconstruction project, a new swing span was floated into place on October 29, 2004 and two lanes of Manhattan-bound traffic opened on December 6, 2004. Additional work covered redesign of the approach ramps to the bridge on the Bronx side and off the bridge in Manhattan. Discovery Channel made a television show about the installation.