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The Bluff Dale Suspension Bridge is a historic bridge located near Bluff Dale, Texas, United States. The bridge was built in 1891 and the spans across the Paluxy River. The road deck is above the river and held in place by fourteen one-inch cables attached to the towers made of nine-inch iron pipe. Despite the name given in Historic American Engineering Record documentation, the Bluff Dale Suspension Bridge is actually a cable-stayed structure. Its deck is suspended from multiple layers of stay cables radiating from the towers, some terminating at the deck and others running continuously from one tower to the other. This pattern of cables was established in designer Edwin Elijah Runyon's first U.S. patent, No. 394,940.〔Stephen G. Buonopane and Mark M. Brown, "History and Engineering Analysis of the 1890 Cable-Stayed Bluff Dale Bridge," in ''Proceedings of the First International Congress on Construction History'' (Madrid: Instituto Juan de Herrera, 2003): 433-442.〕 It is known as one of only two examples of Runyon's patents, along with the Barton Creek Bridge in Huckabay, Texas. Its hand-twisted wire cable and non-traditional use of wrought-iron pipe components make it a notable example of vernacular American bridge construction. The bridge was originally constructed across the river on a dirt road that became Texas state highway 10, which is now U.S. Route 377. In 1933, a new bridge was built to handle the increasing traffic on U.S. 377. The old bridge was relocated in 1934, upstream and extended from .〔("Bluff Dale Suspension Bridge" ''Texas Historic Sites Atlas''. ) Retrieved Aug 26, 2009.〕 The bridge was added to the National Register of Historic Places on December 20, 1977. The bridge is on Preservation Texas' 2009 list of most endangered places due to its poor condition and lack of funds for restoration. It was closed to vehicular traffic in 1989 because of its advanced state of deterioration.〔(【引用サイトリンク】title=Preservation Texas: Most Endangered Places 2009 )〕 ==See also== *List of bridges on the National Register of Historic Places in Texas 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「Bluff Dale Suspension Bridge」の詳細全文を読む スポンサード リンク
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