Ill 146 over Cache River
FairJohnson County, Illinois · 1 MI W of W Vienna · Structure no. 044001400000000
- Built
- 1930
- 95 years old, rebuilt 2010
- Condition
- Fair
- inspected September 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 385 ft
- 2 main spans
- Daily traffic
- 2,250
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 146 over Cache River is a prestressed concrete box beam or girders - multiple carrying Ill 146 over Cache River in Johnson County, Illinois. It was built in 1930 and reconstructed in 2010, so it is 95 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 5 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 2,250 vehicles a day, roughly 15% of them trucks, projected to reach 2,730 by 2046. The structure is 385 ft (117.4 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 | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 146 over Cache River built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 2010.
What condition is Ill 146 over Cache 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 September 2023.
How much traffic does Ill 146 over Cache River carry?
About 2,250 vehicles per day (2023 count), of which roughly 15% are trucks.
How long is Ill 146 over Cache River?
The structure is 385 ft (117.4 m) long with a longest span of 51 ft (15.4 m) and a deck 33 ft wide.
Who owns Ill 146 over Cache River?
It is owned by the State Highway Agency.