I- 55 WB Stevenson over Lock ST
FairCook County, Illinois · 1.1 M SW I94 · Structure no. 016002700000000
- Built
- 1963
- 62 years old, rebuilt 2000
- Condition
- Fair
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 195 ft
- 3 main spans
- Daily traffic
- 75,500
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I- 55 WB Stevenson over Lock ST is a steel continuous stringer/multi-beam or girder carrying I- 55 WB Stevenson over Lock ST 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 75,500 vehicles a day, roughly 8% of them trucks, projected to reach 74,690 by 2046. The structure is 195 ft (59.4 m) long and 73 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 Lock ST 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 Lock 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 July 2024.
How much traffic does I- 55 WB Stevenson over Lock ST carry?
About 75,500 vehicles per day (2024 count), of which roughly 8% are trucks.
How long is I- 55 WB Stevenson over Lock ST?
The structure is 195 ft (59.4 m) long with a longest span of 69 ft (21.1 m) and a deck 73 ft wide.
Who owns I- 55 WB Stevenson over Lock ST?
It is owned by the State Highway Agency.