Structure 27700940016200 · Hillsborough County, NH
Carries Nh 31 over Stony Brook, 0.1 Mi FM Lyndeborough Tl.
Set by its lowest-rated component: Deck and Superstructure at 4 of 9.
How ratings work23 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 rigid-frame bridge.
| State | New Hampshire |
| County | Hillsborough |
| Location | 0.1 Mi FM Lyndeborough Tl |
| Carries | Nh 31 |
| Crosses | Stony Brook |
| Coordinates | 42.86809, -71.77454 |
| Material | Concrete |
| Design | Frame |
| Total Length | 23.0 ft (7 m) |
| Max Span | 20.0 ft (6.1 m) |
| Deck Width | 36.1 ft (11 m) |
| Deck Area | 77 sq m |
| Main Spans | 1 |
| Year Built | 1929 (reconstructed 1983) |
| Avg Daily Traffic | 3,496 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 2 |
| Last Inspection | November 2024 |
| Inspection Frequency | Every 8 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 027700940016200 |
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.