Structure 20401470023500 · Carroll County, NH
Carries Mill Hill Road over Dan Hole River, 146 Ft Fr Dana Merrow 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 | New Hampshire |
| County | Carroll |
| Location | 146 Ft Fr Dana Merrow RD |
| Carries | Mill Hill Road |
| Crosses | Dan Hole River |
| Coordinates | 43.75412, -71.16953 |
| Material | Concrete |
| Design | Slab |
| Total Length | 21.3 ft (6.5 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 23.0 ft (7 m) |
| Deck Area | 45.5 sq m |
| Main Spans | 1 |
| Year Built | 1940 (reconstructed 2019) |
| Avg Daily Traffic | 22 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 2 |
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 020401470023500 |
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.