Ill 47 over Unknown Creek
GoodGrundy County, Illinois · 3.58 M N of I-55 · Structure no. 032200600000000
- Built
- 1994
- 31 years old
- Condition
- Good
- inspected March 2021
- Type
- Culvert
- Concrete Continuous
- Length
- 32 ft
- 2 main spans
- Daily traffic
- 3,600
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 47 over Unknown Creek is a concrete continuous culvert carrying Ill 47 over Unknown Creek in Grundy County, Illinois. It was built in 1994, so it is 31 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 3,600 vehicles a day, roughly 25% of them trucks, projected to reach 4,560 by 2046. The structure is 32 ft (9.9 m) long.
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 |
|---|---|---|
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 47 over Unknown Creek built?
It was built in 1994, making it 31 years old in 2025.
What condition is Ill 47 over Unknown Creek 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 March 2021.
How much traffic does Ill 47 over Unknown Creek carry?
About 3,600 vehicles per day (2023 count), of which roughly 25% are trucks.
How long is Ill 47 over Unknown Creek?
The structure is 32 ft (9.9 m) long with a longest span of 32 ft (9.9 m).
Who owns Ill 47 over Unknown Creek?
It is owned by the State Highway Agency.