Ill 159 over Douglas Creek
PoorSt. Clair County, Illinois · 0.8 M N Smithton · Structure no. 082007100000000
- Built
- 1954
- 71 years old
- Condition
- Poor
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 92 ft
- 3 main spans
- Daily traffic
- 9,400
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 159 over Douglas Creek is a steel continuous stringer/multi-beam or girder carrying Ill 159 over Douglas Creek in St. Clair County, Illinois. It was built in 1954, so it is 71 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.
It carries about 9,400 vehicles a day, roughly 6% of them trucks, projected to reach 9,494 by 2046. The structure is 92 ft (27.9 m) long and 36 ft wide. If it were closed, the detour would be 31.7 mi (51 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Ill 159 over Douglas Creek built?
It was built in 1954, making it 71 years old in 2025.
What condition is Ill 159 over Douglas 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 April 2024.
How much traffic does Ill 159 over Douglas Creek carry?
About 9,400 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is Ill 159 over Douglas Creek?
The structure is 92 ft (27.9 m) long with a longest span of 34 ft (10.5 m) and a deck 36 ft wide.
Who owns Ill 159 over Douglas Creek?
It is owned by the State Highway Agency.