Western portal at the West Side Highway
|Official name||Battery Park Underpass|
|Location||Battery Park, Manhattan, New York City|
|Start||South Street Viaduct, Financial District|
|End||West Street, Battery Park City|
|Opened||April 10, 1951|
|Closed||October 29, 2012|
|Reopened||November 13, 2012|
|No. of lanes||4|
|Operating speed||35 miles per hour (56 km/h)|
|Tunnel clearance||12 feet 7 inches (3.84 m)|
The Battery Park Underpass is a vehicular tunnel at the southernmost tip of Manhattan, New York City, near the neighborhoods of South Ferry and Battery Park City. The tunnel connects FDR Drive, which runs along the east side of Manhattan Island, with the West Side Highway (New York State Route 9A, or NY 9A), which runs along the island's west side. Opened in 1951, it was the second section of the FDR Drive to be completed. The underpass crosses beneath the Battery (formerly Battery Park) and the approach to the Brooklyn–Battery Tunnel.
The underpass started construction in 1949 and opened to the public on April 10, 1951. The underpass runs underneath the Battery, connecting the West Side Highway to the South Street Viaduct with two lanes of traffic in each direction. The project was completed shortly after the opening of the Brooklyn-Battery Tunnel in 1950, and provides direct access between the tunnel and the FDR Drive.
In 2005, during the reconstruction of NY 9A, the western end of the Battery Park Underpass was extended to the north by about 25 feet (7.6 m) to provide a U-turn lane and amenities for pedestrians and bicyclists.
There have been three proposals to extend the tunnel north on the FDR Drive side.