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The Patroon Island Bridge is a major crossing of the Hudson River in Albany, New York. The bridge carries Interstate 90, in the east-west direction, over the Hudson River between Albany and Rensselaer Counties. It has been in service since 1968; however, some structural repairs were made in 1992. The bridge consists of ten spans. Seven spans are considered the main spans and consist of steel trusses and concrete decks. The other three spans are considered approach spans, which are supported by plate girders. The main span over the river-shipping channel is long and wide, and the overall bridge length is . There is an estimated of clearance for shipping on the Hudson River below, which changes with the local tide. Today's replacement cost is estimated to be between $80 and $100 million. The bridge has an HS Inventory load rating of 35 tons, and is inspected annually. The average daily traffic count was 70,787 in 1998 with a 4.5 percent estimated traffic growth during the life of the bridge. The bridge's design is similar to that of the Interstate 35W bridge in Minneapolis, MN, which collapsed during rush hour on August 1, 2007. This realization by New York State transportation officials prompted full-scale inspections of the state's major highway bridges, including the Patroon Island Bridge. Subsequently, the bridge was deemed safe for the time being, but would need substantial repairs and retrofitting in order to ensure motorist safety, and to extend its useful service life if replacement was found not to be a viable option in the near future. The bridge's name comes from the former (Lower) Patroon Island that once existed adjacent to the bridge. A patroon was a proprietor of a tract of land in the 17th-century Dutch colony of New Netherland in North America. == See also == *List of fixed crossings of the Hudson River 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「Patroon Island Bridge」の詳細全文を読む スポンサード リンク
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