Ill 111 SB over Cahokia Canal
Madison County, Illinois · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ill 111 SB over Cahokia Canal in Madison County, Illinois, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1961, making it 64 years old at the 2025 inventory.
- It carries about 4,050 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 46 of the 524 inventoried bridges in Madison County rated poor (8.8%); 46 (8.8%) are rated poor.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (38.66549, -90.09075)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 3 | Serious condition |
| Superstructure | 4 | Poor condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 317 ft |
| Location | 0.24 Mi N I-55/70 |
| NBI structure number | 060012700000000 |
| Condition class | Poor |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Illinois department of transportation.
Busiest bridges in Madison County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Fai 270 over Mississippi River | 1966 | 46,200 | Fair |
| I-270 EB & WB over Chain of Rocks Canal | 2014 | 46,200 | Good |
| 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 |
All bridges nearby: Madison County, IL bridge conditions · every bridge in Madison County · Illinois bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.