Il 171 SB First Av over I- 55 Stevenson
GoodCook County, Illinois · 1.4M SW of IL43 · Structure no. 016151000000000
- Built
- 2015
- 10 years old
- Condition
- Good
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 259 ft
- 3 main spans
- Daily traffic
- 39,600
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 171 SB First Av over I- 55 Stevenson is a steel continuous stringer/multi-beam or girder carrying Il 171 SB First Av over I- 55 Stevenson in Cook County, Illinois. It was built in 2015, so it is 10 years old, younger than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 39,600 vehicles a day, roughly 9% of them trucks, projected to reach 24,089 by 2046. The structure is 259 ft (78.9 m) long and 60 ft wide.
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Il 171 SB First Av over I- 55 Stevenson built?
It was built in 2015, making it 10 years old in 2025.
What condition is Il 171 SB First Av over I- 55 Stevenson in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.
How much traffic does Il 171 SB First Av over I- 55 Stevenson carry?
About 39,600 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is Il 171 SB First Av over I- 55 Stevenson?
The structure is 259 ft (78.9 m) long with a longest span of 92 ft (28.1 m) and a deck 60 ft wide.
Who owns Il 171 SB First Av over I- 55 Stevenson?
It is owned by the State Highway Agency.