Ill 37 over M Fork Big Muddy R
FairFranklin County, Illinois · 0.5 MI N W Frankfort · Structure no. 028003400000000
- Built
- 1938
- 87 years old, rebuilt 1987
- Condition
- Fair
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 367 ft
- 6 main spans
- Daily traffic
- 5,500
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 37 over M Fork Big Muddy R is a steel continuous stringer/multi-beam or girder carrying Ill 37 over M Fork Big Muddy R in Franklin County, Illinois. It was built in 1938 and reconstructed in 1987, so it is 87 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 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 5,500 vehicles a day, roughly 6% of them trucks, projected to reach 5,505 by 2046. The structure is 367 ft (112 m) long and 34 ft wide. If it were closed, the detour would be 8.1 mi (13 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 | 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 Ill 37 over M Fork Big Muddy R built?
It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1987.
What condition is Ill 37 over M Fork Big Muddy R 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 January 2025.
How much traffic does Ill 37 over M Fork Big Muddy R carry?
About 5,500 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is Ill 37 over M Fork Big Muddy R?
The structure is 367 ft (112 m) long with a longest span of 75 ft (22.8 m) and a deck 34 ft wide.
Who owns Ill 37 over M Fork Big Muddy R?
It is owned by the State Highway Agency.