Structure 8720 · Charleston County, SC
Carries Sc 517 over Intracoastal Waterway, 10.1 Mi NE Of Charleston.
Set by its lowest-rated component: Deck and Superstructure and Substructure at 6 of 9.
How ratings work11,461 ft end to end, longest span 135 ft: about 32 football fields, or 2.2 miles. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.
| State | South Carolina |
| County | Charleston |
| Location | 10.1 Mi NE Of Charleston |
| Carries | Sc 517 |
| Crosses | Intracoastal Waterway |
| Coordinates | 32.80305, -79.79772 |
| Material | Prestressed Concrete Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 11461.0 ft (3493.3 m) |
| Max Span | 134.8 ft (41.1 m) |
| Deck Width | 57.1 ft (17.4 m) |
| Deck Area | 60783.4 sq m |
| Main Spans | 101 |
| Year Built | 1993 |
| Avg Daily Traffic | 20,000 (2023) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
| Last Inspection | April 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 000000000008720 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.