Ill 161 over Silver Creek
FairSt. Clair County, Illinois · 2.2 M E JCT 158 · Structure no. 082009500000000
- Built
- 1932
- 93 years old, rebuilt 1992
- Condition
- Fair
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 311 ft
- 6 main spans
- Daily traffic
- 4,950
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 161 over Silver Creek is a steel continuous stringer/multi-beam or girder carrying Ill 161 over Silver Creek in St. Clair County, Illinois. It was built in 1932 and reconstructed in 1992, so it is 93 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 4,950 vehicles a day, roughly 9% of them trucks, projected to reach 5,404 by 2046. The structure is 311 ft (94.9 m) long and 35 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 161 over Silver Creek built?
It was built in 1932, making it 93 years old in 2025. It was reconstructed in 1992.
What condition is Ill 161 over Silver Creek 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 April 2023.
How much traffic does Ill 161 over Silver Creek carry?
About 4,950 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is Ill 161 over Silver Creek?
The structure is 311 ft (94.9 m) long with a longest span of 101 ft (30.8 m) and a deck 35 ft wide.
Who owns Ill 161 over Silver Creek?
It is owned by the State Highway Agency.