Structure 110011002400130 · Harrison County, MS
Carries I 110 over Biloxi Back Bay, 1.3 Mi N US 90.
Set by its lowest-rated component: Superstructure and Substructure at 6 of 9.
How ratings work5,728 ft end to end: about 16 football fields, or 1.1 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 bascule bridge (drawn closed).
| State | Mississippi |
| County | Harrison |
| Location | 1.3 Mi N US 90 |
| Carries | I 110 |
| Crosses | Biloxi Back Bay |
| Coordinates | 30.41123, -88.89385 |
| Material | Steel |
| Design | Movable - Bascule |
| Total Length | 5728.0 ft (1745.9 m) |
| Max Span | 250.0 ft (76.2 m) |
| Deck Width | 88.6 ft (27 m) |
| Deck Area | 47139.3 sq m |
| Main Spans | 1 |
| Year Built | 1973 |
| Avg Daily Traffic | 32,000 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 4 |
| 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 | 5 — Stable for scour |
| Structure Number | 110011002400130 |
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.