Duffy Road over Little Rock Creek
GoodDeKalb County, Illinois · 1000N 1440E · Structure no. 019542700000000
- Built
- 1984
- 41 years old
- Condition
- Good
- inspected April 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 64 ft
- 1 main span
- Daily traffic
- 225
- 2021 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
Duffy Road over Little Rock Creek is a prestressed concrete box beam or girders - multiple carrying Duffy Road over Little Rock Creek in DeKalb County, Illinois. It was built in 1984, so it is 41 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 225 vehicles a day, roughly 12% of them trucks, projected to reach 252 by 2046. The structure is 64 ft (19.5 m) long and 28 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Duffy Road over Little Rock Creek built?
It was built in 1984, making it 41 years old in 2025.
What condition is Duffy Road over Little Rock 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 April 2023.
How much traffic does Duffy Road over Little Rock Creek carry?
About 225 vehicles per day (2021 count), of which roughly 12% are trucks.
How long is Duffy Road over Little Rock Creek?
The structure is 64 ft (19.5 m) long with a longest span of 59 ft (18 m) and a deck 28 ft wide.
Who owns Duffy Road over Little Rock Creek?
It is owned by the Town or Township Highway Agency.