FAP-821 (ILL-15) over Big Muddy Overflow
PoorJefferson County, Illinois · 9 MI E Wash CO LN · Structure no. 041002400000000
- Built
- 1923
- 102 years old, rebuilt 1971
- Condition
- Poor
- inspected February 2025
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 33 ft
- 1 main span
- Daily traffic
- 5,350
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
FAP-821 (ILL-15) over Big Muddy Overflow is a prestressed concrete box beam or girders - multiple carrying FAP-821 (ILL-15) over Big Muddy Overflow in Jefferson County, Illinois. It was built in 1923 and reconstructed in 1971, so it is 102 years old, older than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 2 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.
It carries about 5,350 vehicles a day, roughly 7% of them trucks, projected to reach 5,555 by 2046. The structure is 33 ft (10.1 m) long and 33 ft wide. If it were closed, the detour would be 39.8 mi (64 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 2 Critical | Advanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken. |
| Superstructure | 2 Critical | Advanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was FAP-821 (ILL-15) over Big Muddy Overflow built?
It was built in 1923, making it 102 years old in 2025. It was reconstructed in 1971.
What condition is FAP-821 (ILL-15) over Big Muddy Overflow in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in February 2025.
How much traffic does FAP-821 (ILL-15) over Big Muddy Overflow carry?
About 5,350 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is FAP-821 (ILL-15) over Big Muddy Overflow?
The structure is 33 ft (10.1 m) long with a longest span of 32 ft (9.8 m) and a deck 33 ft wide.
Who owns FAP-821 (ILL-15) over Big Muddy Overflow?
It is owned by the State Highway Agency.