Prairie Hill RD over Rock River
PoorWinnebago County, Illinois · 0.4 MI W Ill 2 · Structure no. 101011800000000
- Built
- 1966
- 59 years old
- Condition
- Poor
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 421 ft
- 5 main spans
- Daily traffic
- 4,200
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Prairie Hill RD over Rock River is a steel continuous stringer/multi-beam or girder carrying Prairie Hill RD over Rock River in Winnebago County, Illinois. It was built in 1966, so it is 59 years old, older than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 4,200 vehicles a day, roughly 3% of them trucks, projected to reach 4,444 by 2046. The structure is 421 ft (128.2 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| 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 Prairie Hill RD over Rock River built?
It was built in 1966, making it 59 years old in 2025.
What condition is Prairie Hill RD over Rock River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.
How much traffic does Prairie Hill RD over Rock River carry?
About 4,200 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is Prairie Hill RD over Rock River?
The structure is 421 ft (128.2 m) long with a longest span of 91 ft (27.7 m) and a deck 36 ft wide.
Who owns Prairie Hill RD over Rock River?
It is owned by the County Highway Agency.