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I-270 Chain of Rocks Bridge

St. Louis, Missouri, and Madison County, Illinois

Photos 

New Chain of Rocks Bridge

July 8, 1965

Missouri State Archives

Enlarge

BH Photo #451476

Map 

Description 

Historic US 66 is now routed across this bridge to keep it a continuous route. The old bridge to the south carried US 66 from 1936-1955 and Bypass 66 from 1955-1965.

Facts 

Overview
Steel stringer bridge over Mississippi River on I 270 in St. Louis
Location
St. Louis, Missouri, and Madison County, Illinois
Status
Open to traffic
History
Opened September 2, 1966
Design
Girder
Dimensions
Length of largest span: 242.5 ft.
Total length: 5,411.4 ft. (1.0 mi.)
Deck width: 54.1 ft.
Approximate latitude, longitude
+38.76449, -90.17353   (decimal degrees)
38°45'52" N, 90°10'25" W   (degrees°minutes'seconds")
Approximate UTM coordinates
15/745580/4294436 (zone/easting/northing)
Quadrangle map:
Columbia Bottom
Land survey
T. 47 N., R. 7 E., Sec. 36
Average daily traffic (as of 2017)
59,788
Inventory numbers
MONBI 643 (Missouri bridge number on the National Bridge Inventory)
BH 36588 (Bridgehunter.com ID)
Inspection report (as of June 2017)
Overall condition: Fair
Superstructure condition rating: Fair (5 out of 9)
Substructure condition rating: Fair (5 out of 9)
Deck condition rating: Fair (5 out of 9)
Sufficiency rating: 66 (out of 100)
View more at BridgeReports.com

Categories 

Beam (16,873)
Built 1966 (166)
Built during 1960s (2,145)
Flared (403)
Illinois (4,927)
Interstate 270 (4)
Madison County, Illinois (125)
Mississippi River (232)
Missouri (6,562)
Navigable waterway (2,204)
 Open (40,964)
Over a mile long (309)
Owned by state (16,550)
Span length 175-250 feet (2,058)
St. Louis, Missouri (165)
State line crossing (913)
Steel stringer (6,709)
Total length over 2500 feet (949)
US 66 (302)

Update Log 

  • July 3, 2019: New photos from Joe Sonderman
  • June 25, 2008: Updated by Kim Harvey
  • May 1, 2008: Added by David B. Haun

Sources 

Comments 

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