Structure 24504501400001 · St. Charles County, LA
Carries I0010 over Bonnet Carre Spillway, 1.9 Mi East Of I-55.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 6 of 9.
How ratings work50,772 ft end to end, longest span 150 ft: about 141 football fields, or 9.6 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. Charles |
| Location | 1.9 Mi East Of I-55 |
| Carries | I0010 |
| Crosses | Bonnet Carre Spillway |
| Coordinates | 30.07939, -90.41020 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 50772.0 ft (15475.3 m) |
| Max Span | 149.9 ft (45.7 m) |
| Deck Width | 45.6 ft (13.9 m) |
| Deck Area | 215106.7 sq m |
| Main Spans | 769 |
| Year Built | 1972 |
| Avg Daily Traffic | 48,723 (2021) |
| Truck Traffic | 25% |
| Lanes On Bridge | 2 |
| Last Inspection | November 2024 |
| 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 | 024504501400001 |
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.