Structure 100000100015010 · Frederick County, MD
Carries Md 28 over Br Of Potomac River, 0.58 Mi E Of Rock Hall RD.
21 ft end to end. 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 slab bridge.
| State | Maryland |
| County | Frederick |
| Location | 0.58 Mi E Of Rock Hall RD |
| Carries | Md 28 |
| Crosses | Br Of Potomac River |
| Coordinates | 39.27485, -77.51649 |
| Material | Concrete |
| Design | Slab |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 14.1 ft (4.3 m) |
| Deck Width | 29.9 ft (9.1 m) |
| Deck Area | 58.2 sq m |
| Main Spans | 1 |
| Year Built | 1937 |
| Avg Daily Traffic | 6,272 (2009) |
| Truck Traffic | 8% |
| Lanes On Bridge | 2 |
| Last Inspection | January 2025 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 5 — Stable for scour |
| Structure Number | 100000100015010 |
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.