Bridgehunter.com | Alton Bridge

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Photos

Overview

These first two photos were taken Oct. 1988 by John P. Herr for the Historic American Engineering Record while documenting the Alton Lock and Dam

Clark Bridge, January 1994

video filmed in the final days the bridge was open to traffic

Riverbender.com

Overview: Lost seven-span through truss bridge over the Mississippi River on US 67 at Alton
Location: Alton, Madison County, Illinois, and St. Charles County, Missouri
Status: Replaced by the Clark Bridge
History: Built 1928; closed for major repairs in 1959 and 1975; permanently closed January 4, 1994; first span imploded August 11, 1994, other 6 spans imploded August-October 1994
Builder: - Alton-St. Louis Bridge Co
Design: Pennsylvania through truss
Dimensions: Length of largest span: 444.9 ft.
Total length: 3,553.3 ft. (0.7 mi.)
Deck width: 20.0 ft.
Vertical clearance above deck: 14.6 ft.
Also called: Clark Bridge (official name)
Approximate latitude, longitude: +38.88325, -90.18229 (decimal degrees)
38°52'60" N, 90°10'56" W (degrees°minutes'seconds")
Approximate UTM coordinates: 15/744411/4307594 (zone/easting/northing)
USGS topographic map: Alton
Inventory numbers: MoDOT K-984R1 (Missouri Dept. of Transportation bridge number)
BH 15487 (Bridgehunter.com ID)
Inspection (as of 10/1991): Deck condition rating: Satisfactory (6 out of 9)
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 16.3 (out of 100)
Average daily traffic (as of 1989): 18,769

Alton Bridge

Posted February 5, 2011, by Sharon Spear (sweetsexysharon [at] gmail [dot] com)

This photo looking from Mo to IL shows the Alton Bridge, the Alton Railroad bridge, old Lock and Dam No. 26. The image was taken in 1940.