Alva Thomas Road over Mill Bayou
Bay County, Florida · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Alva Thomas Road over Mill Bayou in Bay 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 2003, making it 22 years old at the 2025 inventory.
- It carries about 55 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 42 of the 131 inventoried bridges in Bay County rated good (32.1%); 13 (9.9%) 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 December 2024, 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 → (30.20853, -85.60079)
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 slab |
| Length | about 23 ft |
| Location | 0.6 Mi East of US231/SR75 |
| NBI structure number | 464127 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | December 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Florida department of transportation.
Busiest bridges in Bay County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR30 US98 Eastbd over Seaport Drive | 2020 | 34,860 | Good |
| US98 SR30 EB over SR 368 23rd St. & RR | 2020 | 34,860 | Good |
| US98 SR30 over St. Andrews Bay | 2004 | 34,066 | Fair |
| US98 SR30 over St. Andrews Bay | 2003 | 34,066 | Fair |
| US98 SR30 WB over Collegiate Dr | 2019 | 34,066 | Good |
| US231 SR75 over Mill Bayou | 1951 | 34,000 | Fair |
All bridges nearby: Bay County, FL bridge conditions · every bridge in Bay County · Florida bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.