Ill 143 over Cahokia Creek
FairMadison County, Illinois · NW Ill 159 · Structure no. 060008300000000
- Built
- 1937
- 88 years old, rebuilt 1983
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 197 ft
- 3 main spans
- Daily traffic
- 7,950
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 143 over Cahokia Creek is a steel continuous stringer/multi-beam or girder carrying Ill 143 over Cahokia Creek in Madison County, Illinois. It was built in 1937 and reconstructed in 1983, so it is 88 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 6 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 7,950 vehicles a day, roughly 5% of them trucks, projected to reach 8,828 by 2046. The structure is 197 ft (59.9 m) long and 55 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 143 over Cahokia Creek built?
It was built in 1937, making it 88 years old in 2025. It was reconstructed in 1983.
What condition is Ill 143 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 May 2024.
How much traffic does Ill 143 over Cahokia Creek carry?
About 7,950 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is Ill 143 over Cahokia Creek?
The structure is 197 ft (59.9 m) long with a longest span of 77 ft (23.5 m) and a deck 55 ft wide.
Who owns Ill 143 over Cahokia Creek?
It is owned by the State Highway Agency.