Structure 200000HO0275030 · Howard County, MD
Carries Thunder Hill Road over Trib. To Little Patuxent, 1/8 Mi S Of Md 108.
A culvert 24 ft across. 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, so those are drawn as typical for a culvert.
| State | Maryland |
| County | Howard |
| Location | 1/8 Mi S Of Md 108 |
| Carries | Thunder Hill Road |
| Crosses | Trib. To Little Patuxent |
| Coordinates | 39.37683, -77.38813 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 4.9 ft (1.5 m) |
| Deck Area | 71.5 sq m |
| Year Built | 1972 |
| Avg Daily Traffic | 220 (2024) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
| Last Inspection | February 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 200000HO0275030 |
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.