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I-270 EB & WB over Chain of Rocks Canal

Madison County, Illinois · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

I-270 EB & WB over Chain of Rocks Canal in Madison County, Illinois, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 7 (good condition) on the 0-9 scale.
It was built in 2014, making it 11 years old at the 2025 inventory.
It carries about 46,200 vehicles a day (traffic count year 2023).
Its listed owner is the state highway agency.
It is one of 247 of the 524 inventoried bridges in Madison County rated good (47.1%); 46 (8.8%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Continuous steel stringer or multi-beam girder
Length	about 1,980 ft
Location	2 Mi E Mississippi R
NBI structure number	060034500000000
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.

Bridge	Built	Vehicles/day	Condition
Fai 270 over Mississippi River	1966	46,200	Fair
Fai 270 EB over Mississippi River	2024	46,200	Good
Fai 270 over Water Main	1964	46,200	Good
I-55/70 over Brush Creek	1962	46,000	Fair
Fai 70 over Canteen Ck	1939	45,600	Good
Fai 255 over Mcdonough Lake Ditch	1987	40,300	Good