US 321 over Black Swamp
Jasper County, South Carolina · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 321 over Black Swamp in Jasper County, South Carolina, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1948, making it 77 years old at the 2025 inventory.
- It carries about 2,600 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 97 of the 129 inventoried bridges in Jasper County rated fair (75.2%); 2 (1.6%) 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 → (32.58833, -81.20167)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 7 | Good condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Concrete tee beam |
| Length | about 134 ft |
| Location | 1.5MI SE of Hamp Co Ln |
| NBI structure number | 000000000001515 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Carolina department of transportation.
Busiest bridges in Jasper County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-95 NB over S.c. 46 | 1968 | 33,200 | Fair |
| I-95 SB over S.c. 46 | 1968 | 33,200 | Fair |
| US 278/INDPNDCBLVD over Unnamed Stream | 1986 | 32,600 | Fair |
| US 278/INDPNDCBLVD over Unnamed Stream | 1986 | 32,600 | Good |
| I-95 NB over Savannah Overflow | 1975 | 32,050 | Fair |
| I-95 SB over Savannah Overflow | 1975 | 32,050 | Fair |
All bridges nearby: Jasper County, SC bridge conditions · every bridge in Jasper County · South Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.