SR-105 & Sr-a1a over Nassau Sound
Nassau County, Florida · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR-105 & Sr-a1a over Nassau Sound in Nassau County, Florida, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1999, making it 26 years old at the 2025 inventory.
- It carries about 5,000 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 52 of the 106 inventoried bridges in Nassau County rated good (49.1%); 3 (2.8%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2023, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (30.51806, -81.45028)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 5,129 ft |
| Location | 10 Mi. S. of Fernandina |
| NBI structure number | 740105 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Florida department of transportation.
Busiest bridges in Nassau County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-95 NB (SR-9) over St. Marys River | 1971 | 75,637 | Fair |
| I-95 (SR-9) over Lofton Creek | 1968 | 56,500 | Fair |
| I-95 (SR-9) over Cat Creek | 1968 | 56,500 | Fair |
| I-95 (sbl) over St Marys River | 1971 | 54,710 | Fair |
| SR-200 and A1A over Lofton Creek | 2019 | 45,500 | Good |
| I-95 SB (SR-9) over Sr-a1a & SR-200 | 1967 | 34,000 | Good |
All bridges nearby: Nassau County, FL bridge conditions · every bridge in Nassau County · Florida bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.