Structure 624804520100001 · St. John the Baptist County, LA
Carries I0055 over US 51 & Swamp, I055.
75,831 ft end to end, longest span 70 ft: about 211 football fields, or 14.4 miles. 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 or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.
| State | Louisiana |
| County | St. John the Baptist |
| Location | I055 |
| Carries | I0055 |
| Crosses | US 51 & Swamp |
| Coordinates | 30.08563, -90.43101 |
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 75831.0 ft (23113.3 m) |
| Max Span | 69.9 ft (21.3 m) |
| Deck Width | 42.7 ft (13 m) |
| Deck Area | 300472.9 sq m |
| Main Spans | 223 |
| Year Built | 1975 |
| Avg Daily Traffic | 24,000 (2016) |
| Truck Traffic | 25% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 4 |
| 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 | 624804520100001 |
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.