Structure 5550670017900 · Coos County, NH
Carries Base Station Road over Black Brook, 2.98 Mi NE Jct RTE US 302.
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 | New Hampshire |
| County | Coos |
| Location | 2.98 Mi NE Jct RTE US 302 |
| Carries | Base Station Road |
| Crosses | Black Brook |
| Coordinates | 44.26560, -71.40769 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 24.0 ft (7.3 m) |
| Max Span | 24.0 ft (7.3 m) |
| Deck Area | 53.3 sq m |
| Main Spans | 1 |
| Year Built | 1934 (reconstructed 1969) |
| Avg Daily Traffic | 1,793 (2023) |
| Truck Traffic | 10% |
| Lanes On Bridge | 2 |
| Last Inspection | June 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 005550670017900 |
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.