Mill RD over Johnson Creek
FairCarroll County, Illinois · 1.5 MI S. Mt Carroll · Structure no. 008362200000000
- Built
- 1989
- 36 years old
- Condition
- Fair
- inspected May 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 56 ft
- 1 main span
- Daily traffic
- 50
- 2021 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
Mill RD over Johnson Creek is a prestressed concrete box beam or girders - multiple carrying Mill RD over Johnson Creek in Carroll County, Illinois. It was built in 1989, so it is 36 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 50 vehicles a day, roughly 12% of them trucks, projected to reach 51 by 2046. The structure is 56 ft (17.2 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mill RD over Johnson Creek built?
It was built in 1989, making it 36 years old in 2025.
What condition is Mill RD over Johnson Creek 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 May 2024.
How much traffic does Mill RD over Johnson Creek carry?
About 50 vehicles per day (2021 count), of which roughly 12% are trucks.
How long is Mill RD over Johnson Creek?
The structure is 56 ft (17.2 m) long with a longest span of 54 ft (16.4 m) and a deck 24 ft wide.
Who owns Mill RD over Johnson Creek?
It is owned by the Town or Township Highway Agency.