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The Macombs Dam Bridge () spans the Harlem River in New York City, connecting the boroughs of Manhattan and the Bronx near Yankee Stadium. It is the third-oldest bridge in New York City〔 and, along with the 155th Street Viaduct, was designated a New York City Landmark in January 1992. The bridge is operated and maintained by the New York City Department of Transportation (NYCDOT). ==History and description== The bridge is located from the mouth of the Harlem River. It consists of a swing bridge over the Harlem River decorated with four finials and with stone end piers with shelter houses, and a camelback span over the railroad tracks on the Bronx side. The main swing span is long and provides two shipping channels with of horizontal clearance. When closed the bridge provides of vertical clearance. The bridge's total length is . The current bridge is the most recent of several bridges in the area, the first of which – along with the since-demolished lock-and-dam system – opened in 1814. The wooden Central Bridge followed in 1861, to be replaced by the current bridge, which was also called the Central Bridge;〔, pp. 204-205〕 a plaque bearing this name still be seen on the swing span. However the name never stuck, and the old name Macombs Dam Bridge remained in popular use. Construction began in 1890 and was completed in 1895〔 at a total cost of $1.3 million. The bridge, which was designed by consulting engineer Alfred Pancoast Boller,〔, p. 547〕 opened on May 1, 1895. The New York City Department of Transportation (NYCDOT) began a $145 million renovation of this bridge in 1999. At the western end of the bridge is a long steel viaduct〔 leading to the intersection of 155th Street and Adam Clayton Powell, Jr. Boulevard (Seventh Avenue), both of which end at the bridge. At the eastern end, a steel approach road leads to Jerome Avenue, which extends north into the Bronx and Westchester County. Immediately to the north of the bridge was another swing bridge along which the now-demolished 9th Avenue El reached the Bronx and the IRT Jerome Avenue Line. That bridge was demolished sometime after this section of the 9th Avenue El ceased operation in 1958. For 2011, the NYCDOT, which operates and maintains the bridge, reported an average daily traffic volume in both directions of 44,311; having reached a peak AADT of 55,609 in 1957. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Macombs Dam Bridge」の詳細全文を読む スポンサード リンク
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