I-55 Wb; US 40 WB over ST Clair Ave
FairSt. Clair County, Illinois · W of Esl Tri-Level · Structure no. 082001500000000
- Built
- 1960
- 65 years old, rebuilt 1992
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 86 ft
- 1 main span
- Daily traffic
- 33,250
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I-55 Wb; US 40 WB over ST Clair Ave is a steel stringer/multi-beam or girder carrying I-55 Wb; US 40 WB over ST Clair Ave in St. Clair County, Illinois. It was built in 1960 and reconstructed in 1992, so it is 65 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 33,250 vehicles a day, roughly 18% of them trucks, projected to reach 33,987 by 2046. The structure is 86 ft (26.2 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-55 Wb; US 40 WB over ST Clair Ave built?
It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1992.
What condition is I-55 Wb; US 40 WB over ST Clair Ave 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 2023.
How much traffic does I-55 Wb; US 40 WB over ST Clair Ave carry?
About 33,250 vehicles per day (2024 count), of which roughly 18% are trucks.
How long is I-55 Wb; US 40 WB over ST Clair Ave?
The structure is 86 ft (26.2 m) long with a longest span of 83 ft (25.3 m) and a deck 60 ft wide.
Who owns I-55 Wb; US 40 WB over ST Clair Ave?
It is owned by the State Highway Agency.