I-55 NB over Salt Creek Overflow
FairLogan County, Illinois · 1.6M S Il 10 · Structure no. 054004300000000
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 206 ft
- 3 main spans
- Daily traffic
- 13,750
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-55 NB over Salt Creek Overflow is a prestressed concrete stringer/multi-beam or girder carrying I-55 NB over Salt Creek Overflow in Logan 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 5 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 13,750 vehicles a day, roughly 32% of them trucks, projected to reach 13,230 by 2046. The structure is 206 ft (62.8 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-55 NB over Salt Creek Overflow built?
It was built in 1973, making it 52 years old in 2025.
What condition is I-55 NB over Salt Creek Overflow 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 August 2023.
How much traffic does I-55 NB over Salt Creek Overflow carry?
About 13,750 vehicles per day (2023 count), of which roughly 32% are trucks.
How long is I-55 NB over Salt Creek Overflow?
The structure is 206 ft (62.8 m) long with a longest span of 68 ft (20.7 m) and a deck 58 ft wide.
Who owns I-55 NB over Salt Creek Overflow?
It is owned by the State Highway Agency.