US 21 over Sc 5
York County, South Carolina · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 21 over Sc 5 in York County, South Carolina, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1965, making it 60 years old at the 2025 inventory.
- It carries about 12,100 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 146 of the 288 inventoried bridges in York County rated fair (50.7%); 22 (7.6%) 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 June 2024, on a 24-month routine inspection cycle.
- 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 → (34.87208, -80.93176)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 201 ft |
| Location | 6.4 Mi S Rock Hill |
| NBI structure number | 000000000004678 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the South Carolina department of transportation.
Busiest bridges in York County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-77 over Steel Creek | 1973 | 130,800 | Fair |
| I-77 over S-46-1441 | 1973 | 130,800 | Fair |
| I-77 over S-46-100 | 1973 | 125,800 | Fair |
| I-77 over Catawba River | 1973 | 124,700 | Fair |
| I-77 over US 21 | 1973 | 92,100 | Fair |
| I-77 over Trib-catawba River | 1975 | 92,100 | Fair |
All bridges nearby: York County, SC bridge conditions · every bridge in York County · South Carolina bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.