Knob Prairie RD over Unnamed Creek
GoodFranklin County, Illinois · 4.6 MI S. of Ill. 14 · Structure no. 028341700000000
- Built
- 2016
- 9 years old
- Condition
- Good
- inspected March 2022
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 36 ft
- 1 main span
- Daily traffic
- 20
- 2024 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
Knob Prairie RD over Unnamed Creek is a prestressed concrete box beam or girders - multiple carrying Knob Prairie RD over Unnamed Creek in Franklin County, Illinois. It was built in 2016, so it is 9 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 20 vehicles a day, roughly 15% of them trucks, projected to reach 51 by 2046. The structure is 36 ft (11.1 m) long and 24 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Knob Prairie RD over Unnamed Creek built?
It was built in 2016, making it 9 years old in 2025.
What condition is Knob Prairie RD over Unnamed 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 2022.
How much traffic does Knob Prairie RD over Unnamed Creek carry?
About 20 vehicles per day (2024 count), of which roughly 15% are trucks.
How long is Knob Prairie RD over Unnamed Creek?
The structure is 36 ft (11.1 m) long with a longest span of 34 ft (10.3 m) and a deck 24 ft wide.
Who owns Knob Prairie RD over Unnamed Creek?
It is owned by the Town or Township Highway Agency.