Structure 35004500609931 · St. Martin County, LA
Carries I0010 over W Atchafalaya Floodway, 2.5 Mi East Of La 347.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 6 of 9.
How ratings work23,440 ft end to end, longest span 573 ft: about 65 football fields, or 4.4 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 girder bridge.
| State | Louisiana |
| County | St. Martin |
| Location | 2.5 Mi East Of La 347 |
| Carries | I0010 |
| Crosses | W Atchafalaya Floodway |
| Coordinates | 30.32332, -91.79200 |
| Material | Steel Continuous |
| Design | Girder and Floorbeam |
| Total Length | 23440.0 ft (7144.5 m) |
| Max Span | 573.2 ft (174.7 m) |
| Deck Width | 43.0 ft (13.1 m) |
| Deck Area | 93592.9 sq m |
| Main Spans | 239 |
| Year Built | 1971 |
| Avg Daily Traffic | 37,370 (2021) |
| Truck Traffic | 22% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 4 |
| Last Inspection | September 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 | 035004500609931 |
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.