Structure 200000F-0409010 · Frederick County, MD
Carries Old Mill Road over Maryland Midland Railroa, 1000 Feet South Of Md 77.
Set by its lowest-rated component: Superstructure and Substructure at 4 of 9.
How ratings work37 ft end to end, longest span 18 ft. Lengths and the car on the deck are drawn to the same scale. 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 | Maryland |
| County | Frederick |
| Location | 1000 Feet South Of Md 77 |
| Carries | Old Mill Road |
| Crosses | Maryland Midland Railroa |
| Coordinates | 39.65651, -77.33477 |
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 37.1 ft (11.3 m) |
| Max Span | 18.0 ft (5.5 m) |
| Deck Width | 17.1 ft (5.2 m) |
| Deck Area | 58.8 sq m |
| Main Spans | 3 |
| Year Built | 1975 (reconstructed 1998) |
| Avg Daily Traffic | 97 (2023) |
| Truck Traffic | 1% |
| Lanes On Bridge | 1 |
| Last Inspection | April 2024 |
| Inspection Frequency | Every 12 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | Not applicable |
| Structure Number | 200000F-0409010 |
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.