Il 108 over I-55
FairMontgomery County, Illinois · Il 108/I-55 Interch. · Structure no. 068004300000000
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 262 ft
- 2 main spans
- Daily traffic
- 2,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Il 108 over I-55 is a steel continuous stringer/multi-beam or girder carrying Il 108 over I-55 in Montgomery County, Illinois. It was built in 1973, so it is 52 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 2,000 vehicles a day, roughly 14% of them trucks, projected to reach 2,222 by 2046. The structure is 262 ft (79.9 m) long and 68 ft wide. If it were closed, the detour would be 14.9 mi (24 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Il 108 over I-55 built?
It was built in 1973, making it 52 years old in 2025.
What condition is Il 108 over I-55 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 June 2023.
How much traffic does Il 108 over I-55 carry?
About 2,000 vehicles per day (2023 count), of which roughly 14% are trucks.
How long is Il 108 over I-55?
The structure is 262 ft (79.9 m) long with a longest span of 99 ft (30.1 m) and a deck 68 ft wide.
Who owns Il 108 over I-55?
It is owned by the State Highway Agency.