Nh175 over Mad River
Fair Condition99 years old2,020 vehicles/day
Location
| State | New Hampshire |
| County | Grafton |
| Location | 6.6 Mi N Jct US 3 |
| Carries | Nh175 |
| Crosses | Mad River |
| Coordinates | 43.86173, -71.63228 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete |
| Design | Arch - Deck |
| Total Length | 86.0 ft (26.2 m) |
| Max Span | 86.0 ft (26.2 m) |
| Deck Width | 28.2 ft (8.6 m) |
| Deck Area | 225.3 sq m |
| Main Spans | 1 |
| Year Built | 1927 |
Traffic
| Avg Daily Traffic | 2,020 (2023) |
| Truck Traffic | 10% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 524 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is eligible for the National Register |
| Structure Number | 003501530014700 |