I-77 over US 21
Fair Condition53 years old92,100 vehicles/day
Location
| State | South Carolina |
| County | York |
| Location | 3 Mi N Of Rock Hill |
| Carries | I-77 |
| Crosses | US 21 |
| Coordinates | 34.97361, -80.98694 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 201.1 ft (61.3 m) |
| Max Span | 136.2 ft (41.5 m) |
| Deck Width | 139.4 ft (42.5 m) |
| Deck Area | 2605.2 sq m |
| Main Spans | 3 |
| Year Built | 1973 (reconstructed 2000) |
Traffic
| Avg Daily Traffic | 92,100 (2023) |
| Truck Traffic | 14% |
| Lanes On Bridge | 8 |
| Lanes Under Bridge | 6 |
Inspection & Ownership
| Last Inspection | 324 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000006393 |