Structure 740058 · Nassau County, FL
Carries Sr-a1a & Sr-200 over Nann Swamp, 3.8 Mi. W. Of I-95.
A culvert 21 ft across with 2 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 | Florida |
| County | Nassau |
| Location | 3.8 Mi. W. Of I-95 |
| Carries | Sr-a1a & Sr-200 |
| Crosses | Nann Swamp |
| Coordinates | 30.61596, -81.71014 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 9.8 ft (3 m) |
| Deck Area | 122.2 sq m |
| Main Spans | 2 |
| Year Built | 1936 (reconstructed 2006) |
| Avg Daily Traffic | 22,000 (2023) |
| Truck Traffic | 9% |
| Lanes On Bridge | 4 |
| Last Inspection | September 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 740058 |
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.