Il 2 over Rock River
FairLee County, Illinois · At Grand Detour · Structure no. 052006300000000
- Built
- 1994
- 31 years old
- Condition
- Fair
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 1,032 ft
- 4 main spans
- Daily traffic
- 4,850
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 2 over Rock River is a steel continuous stringer/multi-beam or girder carrying Il 2 over Rock River in Lee 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 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 4,850 vehicles a day, roughly 7% of them trucks, projected to reach 5,101 by 2046. The structure is 1,032 ft (314.7 m) long and 42 ft wide. If it were closed, the detour would be 14.9 mi (24 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Il 2 over Rock River built?
It was built in 1994, making it 31 years old in 2025.
What condition is Il 2 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 June 2024.
How much traffic does Il 2 over Rock River carry?
About 4,850 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is Il 2 over Rock River?
The structure is 1,032 ft (314.7 m) long with a longest span of 290 ft (88.4 m) and a deck 42 ft wide.
Who owns Il 2 over Rock River?
It is owned by the State Highway Agency.