• Source: Clark Bridge

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 St. Louis metropolitan area.
The new $85 million, 108-foot-wide bridge (33 m) replaced the old Clark Bridge, which was only 20 ft wide (6.1 m). 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, and its construction process was documented in the 1997 NOVA episode 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". The bridge used 8,100 short tons (7,200 long tons; 7,300,000 kg) of structural steel; 44,100 cubic yards (33,700 m3) of concrete; and more than 160 miles (260 km) of cable wrapped with 4 acres (1.6 ha) of yellow plastic piping.




See also


List of crossings of the Upper Mississippi River
Lewis Bridge




Gallery



































References






External links



Clark Bridge at Structurae
David Goodyear and Ralph Salamie, "The Clark Bridge", from Civil Engineering, August 1994
"Super Bridge", PBS, Companion page for NOVA episode
"Super Bridge", PBS Nova episode, replay of full episode on Archive.org

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