Ill 166 over S Fork Saline River
GoodWilliamson County, Illinois · 3.6 MI S of Ill 13 · Structure no. 100007000000000
- Built
- 1991
- 34 years old
- Condition
- Good
- inspected February 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 121 ft
- 2 main spans
- Daily traffic
- 2,100
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 166 over S Fork Saline River is a prestressed concrete continuous stringer/multi-beam or girder carrying Ill 166 over S Fork Saline River in Williamson County, Illinois. It was built in 1991, so it is 34 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 2,100 vehicles a day, roughly 11% of them trucks, projected to reach 1,919 by 2046. The structure is 121 ft (36.9 m) long and 35 ft wide. If it were closed, the detour would be 26.7 mi (43 km).
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 | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 166 over S Fork Saline River built?
It was built in 1991, making it 34 years old in 2025.
What condition is Ill 166 over S Fork Saline River 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 February 2023.
How much traffic does Ill 166 over S Fork Saline River carry?
About 2,100 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is Ill 166 over S Fork Saline River?
The structure is 121 ft (36.9 m) long with a longest span of 69 ft (21.1 m) and a deck 35 ft wide.
Who owns Ill 166 over S Fork Saline River?
It is owned by the State Highway Agency.