6-659: The Madison Avenue Bridge is a four-lane swing bridge crossing the Harlem River in New York City , carrying East 138th Street between the boroughs of Manhattan and the Bronx . It was designed by Alfred P. Boller and built in 1910, doubling the capacity of an earlier swing bridge built in 1884. The bridge is operated and maintained by the New York City Department of Transportation . For 2011,
12-480: A river or canal , for example, allows traffic to cross. When a water vessel needs to pass the bridge, road traffic is stopped (usually by traffic signals and barriers), and then motors rotate the bridge horizontally about its pivot point. The typical swing bridge will rotate approximately 90 degrees, or one-quarter turn; however, a bridge which intersects the navigation channel at an oblique angle may be built to rotate only 45 degrees, or one-eighth turn, in order to clear
18-406: Is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right. In its closed position, a swing bridge carrying a road or railway over
24-606: The NYCDOT reported an average daily traffic volume in both directions of 41,423; having reached a peak of 49,487 in 2002. Between 2000 and 2014, the bridge opened for vessels 69 times. The bridge is part of the course for the annual New York City Marathon . The runners cross from Manhattan to the Bronx via the Willis Avenue Bridge , follow a short course through the South Bronx , and then return to Manhattan for
30-473: The channel. Small swing bridges as found over narrow canals may be pivoted only at one end, opening as would a gate, but require substantial underground structure to support the pivot. Many inner cities have swing bridges, since these require less street space than other types of bridges. (A "swing bridge" in New Zealand refers to a flexible walking track bridge which "swings" as you walk across.) In
36-695: The race's final leg via the Madison Avenue Bridge. The Madison Avenue Bridge carries the Bx33 local bus route operated by MTA New York City Transit , the BxM3 and BxM4 express bus routes operated by the MTA Bus Company , and the BxM4C express bus route operated by Westchester County 's Bee-Line Bus System . Notes Swing bridge A swing bridge (or swing span bridge )
#264735