Ill 23 over I-55
PoorLivingston County, Illinois · 2.23 Mi.N.Of Pontiac · Structure no. 053011500000000
- Built
- 1972
- 53 years old
- Condition
- Poor
- inspected February 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 295 ft
- 2 main spans
- Daily traffic
- 3,900
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Ill 23 over I-55 is a steel continuous stringer/multi-beam or girder carrying Ill 23 over I-55 in Livingston County, Illinois. It was built in 1972, so it is 53 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 3,900 vehicles a day, roughly 17% of them trucks, projected to reach 4,308 by 2035. The structure is 295 ft (89.9 m) long and 68 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ill 23 over I-55 built?
It was built in 1972, making it 53 years old in 2025.
What condition is Ill 23 over I-55 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 Ill 23 over I-55 carry?
About 3,900 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is Ill 23 over I-55?
The structure is 295 ft (89.9 m) long with a longest span of 116 ft (35.3 m) and a deck 68 ft wide.
Who owns Ill 23 over I-55?
It is owned by the State Highway Agency.