Il 171 SB over 47th ST
GoodCook County, Illinois · 1.3 M N I-55 · Structure no. 016100000000000
- Built
- 1968
- 57 years old, rebuilt 2015
- Condition
- Good
- inspected October 2021
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 177 ft
- 3 main spans
- Daily traffic
- 40,100
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 171 SB over 47th ST is a steel continuous stringer/multi-beam or girder carrying Il 171 SB over 47th ST in Cook County, Illinois. It was built in 1968 and reconstructed in 2015, so it is 57 years old, older 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 40,100 vehicles a day, roughly 9% of them trucks, projected to reach 19,443 by 2046. The structure is 177 ft (53.9 m) long and 44 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 | 8 Very Good | No problems noted. |
| 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 Il 171 SB over 47th ST built?
It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2015.
What condition is Il 171 SB over 47th ST 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 October 2021.
How much traffic does Il 171 SB over 47th ST carry?
About 40,100 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is Il 171 SB over 47th ST?
The structure is 177 ft (53.9 m) long with a longest span of 98 ft (30 m) and a deck 44 ft wide.
Who owns Il 171 SB over 47th ST?
It is owned by the State Highway Agency.