Il 83 171 over Cal Sag Extension
FairCook County, Illinois · 0.2 M S Il 171 · Structure no. 016102200000000
- Built
- 1935
- 90 years old, rebuilt 1997
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 502 ft
- 10 main spans
- Daily traffic
- 20,500
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 83 171 over Cal Sag Extension is a steel continuous stringer/multi-beam or girder carrying Il 83 171 over Cal Sag Extension in Cook County, Illinois. It was built in 1935 and reconstructed in 1997, so it is 90 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 20,500 vehicles a day, roughly 4% of them trucks, projected to reach 25,856 by 2046. The structure is 502 ft (153.1 m) long and 57 ft wide. If it were closed, the detour would be 9.9 mi (16 km).
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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Il 83 171 over Cal Sag Extension built?
It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1997.
What condition is Il 83 171 over Cal Sag Extension 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 June 2023.
How much traffic does Il 83 171 over Cal Sag Extension carry?
About 20,500 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is Il 83 171 over Cal Sag Extension?
The structure is 502 ft (153.1 m) long with a longest span of 50 ft (15.3 m) and a deck 57 ft wide.
Who owns Il 83 171 over Cal Sag Extension?
It is owned by the State Highway Agency.