Old US 51 over Pass Manchac
Poor Condition69 years old4,107 vehicles/day
Location
| State | Louisiana |
| County | Tangipahoa |
| Location | Pass Manchac |
| Carries | Old US 51 |
| Crosses | Pass Manchac |
| Coordinates | 30.28110, -90.40030 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 5 (Fair) |
| Superstructure | 4 (Poor) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 2 — Bridge closed (monitoring) |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 3012.1 ft (918.1 m) |
| Max Span | 285.1 ft (86.9 m) |
| Deck Width | 33.5 ft (10.2 m) |
| Deck Area | 9364.6 sq m |
| Main Spans | 1 |
| Year Built | 1957 |
Traffic
| Avg Daily Traffic | 4,107 (2021) |
| Truck Traffic | 12% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | December 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 625304529000003 |