Ill 78 over Johnson Creek
FairCarroll County, Illinois · 0.5 MI S JCT Ill 40 · Structure no. 008003100000000
- Built
- 1984
- 41 years old
- Condition
- Fair
- inspected May 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 74 ft
- 1 main span
- Daily traffic
- 1,700
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 78 over Johnson Creek is a prestressed concrete box beam or girders - multiple carrying Ill 78 over Johnson Creek in Carroll 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 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 1,700 vehicles a day, roughly 17% of them trucks, projected to reach 1,818 by 2046. The structure is 74 ft (22.7 m) long and 33 ft wide. If it were closed, the detour would be 21.7 mi (35 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 | 8 Very Good | No problems noted. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 78 over Johnson Creek built?
It was built in 1984, making it 41 years old in 2025.
What condition is Ill 78 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 Ill 78 over Johnson Creek carry?
About 1,700 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is Ill 78 over Johnson Creek?
The structure is 74 ft (22.7 m) long with a longest span of 71 ft (21.6 m) and a deck 33 ft wide.
Who owns Ill 78 over Johnson Creek?
It is owned by the State Highway Agency.