Structure 624804520108453 · St. John the Baptist County, LA
Carries Old US 51 over Drainage Pipe Xing, 2.0 M N -i55 & Us51 Exit.
A culvert 20 ft across with 4 openings. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.
| State | Louisiana |
| County | St. John the Baptist |
| Location | 2.0 M N -i55 & Us51 Exit |
| Carries | Old US 51 |
| Crosses | Drainage Pipe Xing |
| Coordinates | 30.20439, -90.42540 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 20.0 ft (6.1 m) |
| Max Span | 3.9 ft (1.2 m) |
| Deck Width | 64.0 ft (19.5 m) |
| Deck Area | 119.0 sq m |
| Main Spans | 4 |
| Year Built | 1960 |
| Avg Daily Traffic | 4,107 (2021) |
| Truck Traffic | 12% |
| Lanes On Bridge | 2 |
| Last Inspection | June 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 624804520108453 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.