Nh 31 over Stony Brook
Poor Condition97 years old3,496 vehicles/day
Location
| State | New Hampshire |
| County | Hillsborough |
| Location | 0.1 Mi FM Lyndeborough Tl |
| Carries | Nh 31 |
| Crosses | Stony Brook |
| Coordinates | 42.86809, -71.77454 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 4 (Poor) |
| Superstructure | 4 (Poor) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| 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) |
Traffic
| Avg Daily Traffic | 3,496 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | November 2024 |
| Inspection Frequency | Every 8 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Structure Number | 027700940016200 |