Al - 4 (us 78) over I 20
FairSt. Clair County, Alabama · US 78 * I 20 Riverside · Structure no. 008243
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected July 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 350 ft
- 4 main spans
- Daily traffic
- 8,520
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Al - 4 (us 78) over I 20 is a concrete continuous tee beam carrying Al - 4 (us 78) over I 20 in St. Clair County, Alabama. It was built in 1964, so it is 61 years old, older 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 8,520 vehicles a day, roughly 6% of them trucks, projected to reach 10,988 by 2043. The structure is 350 ft (106.7 m) long and 34 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Al - 4 (us 78) over I 20 built?
It was built in 1964, making it 61 years old in 2025.
What condition is Al - 4 (us 78) over I 20 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 July 2023.
How much traffic does Al - 4 (us 78) over I 20 carry?
About 8,520 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is Al - 4 (us 78) over I 20?
The structure is 350 ft (106.7 m) long with a longest span of 96 ft (29.3 m) and a deck 34 ft wide.
Who owns Al - 4 (us 78) over I 20?
It is owned by the State Highway Agency.