Old US 51 over North Pass
PoorTangipahoa Parish, Louisiana · North Pass · Structure no. 625304529001903
- Built
- 1960
- 65 years old
- Condition
- Poor
- inspected May 2024
- Type
- Slab
- Concrete
- Length
- 1,352 ft
- 54 main spans
- Daily traffic
- 4,107
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
Old US 51 over North Pass is a concrete slab carrying Old US 51 over North Pass in Tangipahoa Parish, Louisiana. It was built in 1960, so it is 65 years old, older than the Louisiana average of 43 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 4,107 vehicles a day, roughly 12% of them trucks, projected to reach 4,517 by 2041. The structure is 1,352 ft (412.1 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 North Pass built?
It was built in 1960, making it 65 years old in 2025.
What condition is Old US 51 over North Pass in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.
How much traffic does Old US 51 over North Pass carry?
About 4,107 vehicles per day (2021 count), of which roughly 12% are trucks.
How long is Old US 51 over North Pass?
The structure is 1,352 ft (412.1 m) long with a longest span of 25 ft (7.6 m) and a deck 34 ft wide.
Who owns Old US 51 over North Pass?
It is owned by the State Highway Agency.