US 521 over Spring Valley Swamp
Fair Condition95 years old3,100 vehicles/day
Location
| State | South Carolina |
| County | Williamsburg |
| Location | 5 Mi NW Of Andrews |
| Carries | US 521 |
| Crosses | Spring Valley Swamp |
| Coordinates | 33.52537, -79.67242 |
Condition Ratings
| Overall Condition | Fair |
| Channel/Waterway | 5 (Fair) |
| Culvert | 5 (Fair) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete |
| Design | Culvert |
| Total Length | 40.0 ft (12.2 m) |
| Max Span | 12.1 ft (3.7 m) |
| Deck Area | 96.4 sq m |
| Main Spans | 3 |
| Year Built | 1931 (reconstructed 1965) |
Traffic
| Avg Daily Traffic | 3,100 (2023) |
| Truck Traffic | 16% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 423 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000000584 |