US 521 NB over Twelve Mile Creek
Fair Condition49 years old12,150 vehicles/day
Location
| State | South Carolina |
| County | Lancaster |
| Location | 12.0 Mi N Lancaster |
| Carries | US 521 NB |
| Crosses | Twelve Mile Creek |
| Coordinates | 34.91557, -80.81514 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 284.1 ft (86.6 m) |
| Max Span | 43.0 ft (13.1 m) |
| Deck Width | 43.0 ft (13.1 m) |
| Deck Area | 1134.5 sq m |
| Main Spans | 2 |
| Year Built | 1977 |
Traffic
| Avg Daily Traffic | 12,150 (2023) |
| Truck Traffic | 6% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 924 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000006997 |