I- 55 EB Stevenson over Throop ST
FairCook County, Illinois · 0.7 M SW I94 · Structure no. 016003000000000
- Built
- 1963
- 62 years old, rebuilt 1999
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 180 ft
- 3 main spans
- Daily traffic
- 66,750
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I- 55 EB Stevenson over Throop ST is a prestressed concrete continuous stringer/multi-beam or girder carrying I- 55 EB Stevenson over Throop ST in Cook County, Illinois. It was built in 1963 and reconstructed in 1999, 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 66,750 vehicles a day, roughly 9% of them trucks, projected to reach 65,297 by 2046. The structure is 180 ft (55 m) long and 64 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 EB Stevenson over Throop ST built?
It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1999.
What condition is I- 55 EB Stevenson over Throop ST 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 EB Stevenson over Throop ST carry?
About 66,750 vehicles per day (2024 count), of which roughly 9% are trucks.
How long is I- 55 EB Stevenson over Throop ST?
The structure is 180 ft (55 m) long with a longest span of 69 ft (21.1 m) and a deck 64 ft wide.
Who owns I- 55 EB Stevenson over Throop ST?
It is owned by the State Highway Agency.