I - 20 over Al - 4 ( US 78)
FairSt. Clair County, Alabama · Eden Exit · Structure no. 019153
- Built
- 2005
- 20 years old
- Condition
- Fair
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 171 ft
- 3 main spans
- Daily traffic
- 53,023
- 2025 count
- Owner
- State
- State Highway Agency
About this bridge
I - 20 over Al - 4 ( US 78) is a prestressed concrete stringer/multi-beam or girder carrying I - 20 over Al - 4 ( US 78) in St. Clair County, Alabama. It was built in 2005, so it is 20 years old, younger than the Alabama average of 51.1 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 53,023 vehicles a day, roughly 28% of them trucks, projected to reach 95,764 by 2045. The structure is 171 ft (52 m) long and 125 ft wide.
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 | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I - 20 over Al - 4 ( US 78) built?
It was built in 2005, making it 20 years old in 2025.
What condition is I - 20 over Al - 4 ( US 78) 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 January 2025.
How much traffic does I - 20 over Al - 4 ( US 78) carry?
About 53,023 vehicles per day (2025 count), of which roughly 28% are trucks.
How long is I - 20 over Al - 4 ( US 78)?
The structure is 171 ft (52 m) long with a longest span of 64 ft (19.5 m) and a deck 125 ft wide.
Who owns I - 20 over Al - 4 ( US 78)?
It is owned by the State Highway Agency.