Old US 51 over Owl Bayou
FairTangipahoa Parish, Louisiana · Owl Bayou · Structure no. 625304529004243
- Built
- 1958
- 67 years old
- Condition
- Fair
- inspected January 2025
- Type
- Slab
- Concrete
- Length
- 100 ft
- 5 main spans
- Daily traffic
- 4,107
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
Old US 51 over Owl Bayou is a concrete slab carrying Old US 51 over Owl Bayou in Tangipahoa Parish, Louisiana. It was built in 1958, so it is 67 years old, older than the Louisiana average of 43 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 4,107 vehicles a day, roughly 12% of them trucks, projected to reach 4,517 by 2041. The structure is 100 ft (30.5 m) long and 46 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old US 51 over Owl Bayou built?
It was built in 1958, making it 67 years old in 2025.
What condition is Old US 51 over Owl Bayou 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 Old US 51 over Owl Bayou carry?
About 4,107 vehicles per day (2021 count), of which roughly 12% are trucks.
How long is Old US 51 over Owl Bayou?
The structure is 100 ft (30.5 m) long with a longest span of 20 ft (6.1 m) and a deck 46 ft wide.
Who owns Old US 51 over Owl Bayou?
It is owned by the State Highway Agency.