Ill 4 over Cahokia Creek
FairMacoupin County, Illinois · 1.0 M N Staunton · Structure no. 059001000000000
- Built
- 1921
- 104 years old, rebuilt 1997
- Condition
- Fair
- inspected February 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 309 ft
- 4 main spans
- Daily traffic
- 2,800
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 4 over Cahokia Creek is a steel continuous stringer/multi-beam or girder carrying Ill 4 over Cahokia Creek in Macoupin County, Illinois. It was built in 1921 and reconstructed in 1997, so it is 104 years old, older than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 2,800 vehicles a day, roughly 7% of them trucks, projected to reach 2,828 by 2046. The structure is 309 ft (94.2 m) long and 39 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 4 over Cahokia Creek built?
It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1997.
What condition is Ill 4 over Cahokia Creek in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2024.
How much traffic does Ill 4 over Cahokia Creek carry?
About 2,800 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is Ill 4 over Cahokia Creek?
The structure is 309 ft (94.2 m) long with a longest span of 85 ft (26 m) and a deck 39 ft wide.
Who owns Ill 4 over Cahokia Creek?
It is owned by the State Highway Agency.