39TH Ave. South over Big Bayou
Pinellas County, Florida · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 39TH Ave. South over Big Bayou in Pinellas County, Florida, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1955 and reconstructed in 1999, making it 70 years old at the 2025 inventory.
- It carries about 4,509 vehicles a day (traffic count year 2023).
- Its listed owner is a city or municipal highway agency.
- It is one of 154 of the 449 inventoried bridges in Pinellas County rated fair (34.3%); 8 (1.8%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (27.73361, -82.63651)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 83 ft |
| Location | 0.2MI East of 6TH St. So. |
| NBI structure number | 157196 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Florida department of transportation.
Busiest bridges in Pinellas County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-275 SB over 30TH Ave North | 1974 | 158,000 | Good |
| I-275 SB over 22ND Avenue North | 1974 | 158,000 | Good |
| I-275 NB over 22ND Ave North | 1974 | 158,000 | Good |
| I-275 SB over 38TH Avenue North | 1974 | 158,000 | Good |
| I-275 NB over 38TH Avenue North | 1974 | 158,000 | Good |
| I-275 SB over 50TH Ave N SR-689 | 1972 | 155,500 | Good |
All bridges nearby: Pinellas County, FL bridge conditions · every bridge in Pinellas County · Florida bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.