US 501 Nbl over Back Swamp
Fair Condition95 years old9,700 vehicles/day
Location
| State | South Carolina |
| County | Marion |
| Location | 3 Mi W Of Horry Co |
| Carries | US 501 Nbl |
| Crosses | Back Swamp |
| Coordinates | 34.07382, -79.29644 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 3 — Scour critical |
Physical Characteristics
| Material | Concrete |
| Design | Tee Beam |
| Total Length | 225.1 ft (68.6 m) |
| Max Span | 24.9 ft (7.6 m) |
| Deck Width | 42.7 ft (13 m) |
| Deck Area | 891.8 sq m |
| Main Spans | 9 |
| Year Built | 1931 (reconstructed 1976) |
Traffic
| Avg Daily Traffic | 9,700 (2023) |
| Truck Traffic | 17% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 724 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000000560 |