Clark Bridge

Clark Bridge
View from West Alton, Missouri
Coordinates	38°52′56″N 90°10′44″W / 38.88222°N 90.17889°W / 38.88222; -90.17889
Carries	4 lanes of US 67
Crosses	Mississippi River
Locale	West Alton, Missouri and Alton, Illinois
Other name(s)	Clark Superbridge
Maintained by	Illinois Department of Transportation
Characteristics
Total length	4,620 feet (1,408 m)
Longest span	756 feet (230 m)
History
Opened	January 1994
Location

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).^[1] 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".^[1] 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.^[2]