Structure 5231 · Charleston County, SC
Carries I-26 EB over S-46/heriot ST, In Charleston.
Set by its lowest-rated component: Superstructure and Substructure at 5 of 9.
How ratings work6,184 ft end to end, longest span 97 ft: about 17 football fields, or 1.2 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 | In Charleston |
| Carries | I-26 EB |
| Crosses | S-46/heriot ST |
| Coordinates | 32.81147, -79.95153 |
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 6184.1 ft (1884.9 m) |
| Max Span | 96.8 ft (29.5 m) |
| Deck Width | 93.2 ft (28.4 m) |
| Deck Area | 53531.2 sq m |
| Main Spans | 76 |
| Year Built | 1968 (reconstructed 2005) |
| Avg Daily Traffic | 60,100 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 6 |
| Lanes Under Bridge | 24 |
| Last Inspection | August 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | Not applicable |
| Structure Number | 000000000005231 |
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.