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Alton Bridge

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

BH Photo #102322

Map 

Video 

Clark Bridge, January 1994

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

Riverbender.com

Play video

Facts 

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)
Quadrangle 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

Update Log 

  • May 9, 2010: New video from Kim Harvey
  • March 31, 2009: New photo from Kim Harvey
  • July 3, 2008: Updated by Kim Harvey: added company that built the bridge

Related Bridges 

Sources 

Comments 

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.

http://stltoday.mycapture.com/mycapture/enlarge.asp?image=33...