SR-21 NB over Little Black Creek
Clay County, Florida · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR-21 NB over Little Black Creek in Clay County, Florida, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1985 and reconstructed in 2010, making it 40 years old at the 2025 inventory.
- It carries about 24,000 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 44 of the 90 inventoried bridges in Clay County rated fair (48.9%); 3 (3.3%) 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 → (30.11722, -81.80806)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 5 | Fair condition |
| Superstructure | 5 | Fair condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete slab |
| Length | about 350 ft |
| Location | 3.4 Mi. N. of Cr-220 |
| NBI structure number | 710057 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Florida department of transportation.
Busiest bridges in Clay County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-17 (SR-15) over Doctors Inlet | 1971 | 58,000 | Fair |
| US-17 (SR-15) over Johnson Slough | 1967 | 51,000 | Fair |
| SR-21 over Grog Branch | 1986 | 36,500 | Fair |
| SR-21 over Black Creek | 2010 | 36,500 | Good |
| CR 220 over Swimming Pen Creek | 1996 | 35,000 | Good |
| CR 220 over Grog Branch | 1959 | 34,500 | Fair |
All bridges nearby: Clay County, FL bridge conditions · every bridge in Clay County · Florida bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.