Riddle Hill Road over Smith River
Fair Condition49 years old142 vehicles/day
Location
| State | New Hampshire |
| County | Grafton |
| Location | 0.17mi. RTE 4 |
| Carries | Riddle Hill Road |
| Crosses | Smith River |
| Coordinates | 43.57341, -71.97601 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 5 (Fair) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 24.9 ft (7.6 m) |
| Max Span | 22.0 ft (6.7 m) |
| Deck Width | 24.3 ft (7.4 m) |
| Deck Area | 56.2 sq m |
| Main Spans | 1 |
| Year Built | 1977 |
Traffic
| Avg Daily Traffic | 142 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 823 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Structure Number | 009901250009300 |