Ill 72 over Rock River
FairOgle County, Illinois · E. Edge of Byron · Structure no. 071004000000000
- Built
- 1940
- 85 years old, rebuilt 1990
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 712 ft
- 10 main spans
- Daily traffic
- 7,100
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 72 over Rock River is a steel continuous stringer/multi-beam or girder carrying Ill 72 over Rock River in Ogle County, Illinois. It was built in 1940 and reconstructed in 1990, so it is 85 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 7,100 vehicles a day, roughly 3% of them trucks, projected to reach 7,072 by 2046. The structure is 712 ft (217 m) long and 46 ft wide. If it were closed, the detour would be 31.1 mi (50 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 72 over Rock River built?
It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1990.
What condition is Ill 72 over Rock River 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 August 2024.
How much traffic does Ill 72 over Rock River carry?
About 7,100 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is Ill 72 over Rock River?
The structure is 712 ft (217 m) long with a longest span of 78 ft (23.8 m) and a deck 46 ft wide.
Who owns Ill 72 over Rock River?
It is owned by the State Highway Agency.