Il 111 over Piasa Creek
PoorPosted for loadMacoupin County, Illinois · 0.2 M S JCT Il 16 · Structure no. 059001700000000
- Built
- 1929
- 96 years old, rebuilt 1985
- Condition
- Poor
- inspected October 2024
- Type
- Tee Beam
- Concrete
- Length
- 52 ft
- 1 main span
- Daily traffic
- 4,200
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 111 over Piasa Creek is a concrete tee beam carrying Il 111 over Piasa Creek in Macoupin County, Illinois. It was built in 1929 and reconstructed in 1985, so it is 96 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 4 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: posted for load restriction.
It carries about 4,200 vehicles a day, roughly 11% of them trucks, projected to reach 4,545 by 2046. The structure is 52 ft (15.9 m) long and 36 ft wide. If it were closed, the detour would be 11.8 mi (19 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Il 111 over Piasa Creek built?
It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1985.
What condition is Il 111 over Piasa Creek 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 October 2024.
How much traffic does Il 111 over Piasa Creek carry?
About 4,200 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is Il 111 over Piasa Creek?
The structure is 52 ft (15.9 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.
Who owns Il 111 over Piasa Creek?
It is owned by the State Highway Agency.