US 321 over Sandy River
Chester County, South Carolina · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 321 over Sandy River in Chester County, South Carolina, 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 1940 and reconstructed in 2024, making it 85 years old at the 2025 inventory.
- It carries about 1,750 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 103 of the 191 inventoried bridges in Chester County rated fair (53.9%); 20 (10.5%) 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 → (34.73106, -81.23799)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 6 | Satisfactory condition |
| Substructure | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 149 ft |
| Location | 2.3MI N of Chester |
| NBI structure number | 000000000001018 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Carolina department of transportation.
Busiest bridges in Chester County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-77 NB over Scl Railroad | 1978 | 28,150 | Fair |
| I-77 SB over Scl Railroad | 1978 | 28,150 | Fair |
| I-77 NB over S. Fork Fishing Ck | 1979 | 28,150 | Fair |
| I-77 Nbl over Fishing Creek | 1979 | 28,150 | Fair |
| I-77 SB over S. Fork Fishing Ck | 1979 | 28,150 | Fair |
| I-77 Sbl over Fishing Creek | 1979 | 28,150 | Fair |
All bridges nearby: Chester County, SC bridge conditions · every bridge in Chester County · South Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.