Structure 900101 · Monroe County, FL
Carries US 1 (sr 5) over Moser Channel, Marathon Key (mm 40-46.6).
35,868 ft end to end, longest span 135 ft: about 100 football fields, or 6.8 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 segmental box-girder bridge.
| State | Florida |
| County | Monroe |
| Location | Marathon Key (mm 40-46.6) |
| Carries | US 1 (sr 5) |
| Crosses | Moser Channel |
| Coordinates | 24.69902, -81.16920 |
| Material | Prestressed Concrete Continuous |
| Design | Segmental Box Girder |
| Total Length | 35867.8 ft (10932.5 m) |
| Max Span | 134.8 ft (41.1 m) |
| Deck Width | 38.7 ft (11.8 m) |
| Deck Area | 129003.5 sq m |
| Main Spans | 266 |
| Year Built | 1982 |
| Avg Daily Traffic | 11,300 (2024) |
| Truck Traffic | 17% |
| Lanes On Bridge | 2 |
| Last Inspection | December 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 900101 |
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.