I- 55 WB Stevenson over Western Ave Viaduct
FairCook County, Illinois · 2.5 M SW Dan Ryan · Structure no. 016002600000000
- Built
- 1963
- 62 years old, rebuilt 2000
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 2,135 ft
- 26 main spans
- Daily traffic
- 83,550
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I- 55 WB Stevenson over Western Ave Viaduct is a steel continuous stringer/multi-beam or girder carrying I- 55 WB Stevenson over Western Ave Viaduct in Cook County, Illinois. It was built in 1963 and reconstructed in 2000, so it is 62 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 83,550 vehicles a day, roughly 7% of them trucks, projected to reach 79,134 by 2046. The structure is 2,135 ft (650.7 m) long and 62 ft wide.
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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I- 55 WB Stevenson over Western Ave Viaduct built?
It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2000.
What condition is I- 55 WB Stevenson over Western Ave Viaduct 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 September 2024.
How much traffic does I- 55 WB Stevenson over Western Ave Viaduct carry?
About 83,550 vehicles per day (2024 count), of which roughly 7% are trucks.
How long is I- 55 WB Stevenson over Western Ave Viaduct?
The structure is 2,135 ft (650.7 m) long with a longest span of 118 ft (35.9 m) and a deck 62 ft wide.
Who owns I- 55 WB Stevenson over Western Ave Viaduct?
It is owned by the State Highway Agency.