I - 20 West over Cahaba River
FairJefferson County, Alabama · I20 * Cahaba River · Structure no. 013174
- Built
- 1984
- 41 years old
- Condition
- Fair
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 599 ft
- 4 main spans
- Daily traffic
- 35,000
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
I - 20 West over Cahaba River is a steel stringer/multi-beam or girder carrying I - 20 West over Cahaba River in Jefferson County, Alabama. It was built in 1984, so it is 41 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 35,000 vehicles a day, roughly 21% of them trucks, projected to reach 42,286 by 2044. The structure is 599 ft (182.6 m) long and 59 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I - 20 West over Cahaba River built?
It was built in 1984, making it 41 years old in 2025.
What condition is I - 20 West over Cahaba River 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 October 2024.
How much traffic does I - 20 West over Cahaba River carry?
About 35,000 vehicles per day (2024 count), of which roughly 21% are trucks.
How long is I - 20 West over Cahaba River?
The structure is 599 ft (182.6 m) long with a longest span of 190 ft (57.9 m) and a deck 59 ft wide.
Who owns I - 20 West over Cahaba River?
It is owned by the State Highway Agency.