Il 40 FAP 646 over Walnut Special Ditch
FairBureau County, Illinois · 3.1 MI S JCT Ill 92 · Structure no. 006008600000000
- Built
- 1933
- 92 years old, rebuilt 1994
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 43 ft
- 1 main span
- Daily traffic
- 1,950
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 40 FAP 646 over Walnut Special Ditch is a steel stringer/multi-beam or girder carrying Il 40 FAP 646 over Walnut Special Ditch in Bureau County, Illinois. It was built in 1933 and reconstructed in 1994, so it is 92 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 1,950 vehicles a day, roughly 27% of them trucks, projected to reach 2,323 by 2046. The structure is 43 ft (13 m) long and 43 ft wide. If it were closed, the detour would be 34.8 mi (56 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Il 40 FAP 646 over Walnut Special Ditch built?
It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1994.
What condition is Il 40 FAP 646 over Walnut Special Ditch 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 2024.
How much traffic does Il 40 FAP 646 over Walnut Special Ditch carry?
About 1,950 vehicles per day (2023 count), of which roughly 27% are trucks.
How long is Il 40 FAP 646 over Walnut Special Ditch?
The structure is 43 ft (13 m) long with a longest span of 41 ft (12.5 m) and a deck 43 ft wide.
Who owns Il 40 FAP 646 over Walnut Special Ditch?
It is owned by the State Highway Agency.