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The 11th Street Bridge was completed in December 1915 to carry vehicles across the Arkansas River at Tulsa, Oklahoma. Used from 1916 to 1972, it was also a part of U.S. Route 66.〔(【引用サイトリンク】title=ODOT Memorial Highways & Bridges )〕 Functionally, it has been replaced by the I-244 bridges across the Arkansas. At present, the bridge is in poor structural condition and unsafe even for pedestrians. In 2008, the gates were locked to exclude all visitors.〔Bryan, Emory. "Historic Tulsa Bridge To Remain Closed." May 14, 2009.().〕 This bridge was added on December 13, 1996, to the National Register of Historic Places under Criteria A and C. Its NRIS number is 96001488.〔(【引用サイトリンク】title=Eleventh Street Arkansas River Bridge - Art Deco Buildings in Tulsa - Tulsa Preservation Commission )〕 It was named the "Cyrus Avery Route 66 Memorial Bridge in 2004.〔National Park Service, "11th Street Arkansas River Bridge Tulsa, Oklahoma."()〕 Although the bridge still stands, it is considered unsafe for use and has been closed to vehicles since 1980 and to pedestrians since 2008.〔 ==Construction== Engineered by Harrington, Howard and Ash of Kansas City, this bridge replaced an earlier wooden structure. It was built by the Missouri Valley Bridge and Iron Company for $180,000. A multi-span concrete arch bridge, with 18 spans, it was 1470 feet long and 34 feet wide. It had a railroad track in the center and one vehicular lane on each side of the track. At the time, it was one of the longest concrete structures in the midwestern United States.〔 In 1929, the original balustrades and Victorian-style lights were replaced with Art Deco guardrails and lights. A 1934 project constructed a second arched bridge immediately downstream and connected both bridges with a single deck. This brought the deck width to 52 feet 8 inches, with a roadbed that was wide and accommodated four lanes of traffic.〔 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「11th Street Bridge」の詳細全文を読む スポンサード リンク
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