Ill 15 & US 51 over Little Muddy River
FairWashington County, Illinois · 0.6 MI W C L Ashley · Structure no. 095000200000000
- Built
- 1921
- 104 years old, rebuilt 1968
- Condition
- Fair
- inspected March 2024
- Type
- Tee Beam
- Concrete
- Length
- 30 ft
- 1 main span
- Daily traffic
- 2,300
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 15 & US 51 over Little Muddy River is a concrete tee beam carrying Ill 15 & US 51 over Little Muddy River in Washington County, Illinois. It was built in 1921 and reconstructed in 1968, so it is 104 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 2,300 vehicles a day, roughly 13% of them trucks, projected to reach 2,481 by 2046. The structure is 30 ft (9.1 m) long and 47 ft wide. If it were closed, the detour would be 29.8 mi (48 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 | 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 15 & US 51 over Little Muddy River built?
It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1968.
What condition is Ill 15 & US 51 over Little Muddy 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 March 2024.
How much traffic does Ill 15 & US 51 over Little Muddy River carry?
About 2,300 vehicles per day (2023 count), of which roughly 13% are trucks.
How long is Ill 15 & US 51 over Little Muddy River?
The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 47 ft wide.
Who owns Ill 15 & US 51 over Little Muddy River?
It is owned by the State Highway Agency.