Al - 4 (us 78) over I - 20
FairSt. Clair County, Alabama · US 78 * I 20 Chula Vista · Structure no. 007922
- Built
- 1963
- 62 years old
- Condition
- Fair
- inspected June 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 325 ft
- 4 main spans
- Daily traffic
- 1,010
- 2022 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 1963, so it is 62 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 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 1,010 vehicles a day, roughly 5% of them trucks, projected to reach 1,303 by 2042. The structure is 325 ft (99.1 m) long and 31 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 1963, making it 62 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 June 2023.
How much traffic does Al - 4 (us 78) over I - 20 carry?
About 1,010 vehicles per day (2022 count), of which roughly 5% are trucks.
How long is Al - 4 (us 78) over I - 20?
The structure is 325 ft (99.1 m) long with a longest span of 90 ft (27.4 m) and a deck 31 ft wide.
Who owns Al - 4 (us 78) over I - 20?
It is owned by the State Highway Agency.