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The Clark Bridge is a cable-stayed bridge across the Mississippi River between West Alton, Missouri and Alton, Illinois. Named after explorer William Clark like the bridge it replaced, the cable-stayed bridge opened in 1994. It carries U.S. Route 67 across the river. It is the northernmost river crossing in the Saint Louis metropolitan area. The new $85 million, replaced the old Clark Bridge, which was only .〔(David Goodyear and Ralph Salamie, "The Clark Bridge" ), ''Civil Engineering'', August 1994, accessed 4 August 2009〕 The truss bridge was built in 1928. The new bridge carries two lanes of divided traffic in each direction, as well as two bike lanes. The old bridge carried only two lanes (similar to the upstream Champ Clark Bridge). The bridge is sometimes referred to as the Super Bridge. Its construction was featured in a NOVA documentary entitled ''Super Bridge'', which highlighted the challenges of building the bridge, especially during the Great Flood of 1993. Designed by Hanson Engineers under contract to Illinois Department of Transportation (DOT), the Clark Bridge was the first in the United States in which "such a light steel-framed cable-stayed design was combined with a cable saddle type of pylon."〔(David Goodyear and Ralph Salamie, "The Clark Bridge" ), ''Civil Engineering'', August 1994, accessed 4 August 2009〕 The bridge used 8,100 tons of structural steel; 44,100 cubic yards of concrete; and more than 160 miles of cable wrapped with four acres of yellow plastic piping.〔("Clark Bridge - Alton, Illinois" ), Alton Web, accessed 4 August 2009〕 ==See also== *List of crossings of the Upper Mississippi River *Lewis Bridge Image:Clark Bridge from Melvin Price Locks.jpg|The Clark Bridge. View is upriver to the northwest from the Melvin Price Locks below the bridge Image:Clark Bridge at Alton, Illinois.jpg|Clark Bridge as seen from the Missouri side of the Mississippi File:Altonbridge.jpg|Clark Bridge seen from the Alton Marina Image:2006-09-05 3000x1700 alton clark bridge.jpg File:Clark Bridge P7100193.JPG|Clark Bridge at Alton, Illinois from the Missouri side. 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「Clark Bridge」の詳細全文を読む スポンサード リンク
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