US 4 over Smith River
Poor Condition97 years old2,087 vehicles/day
Location
| State | New Hampshire |
| County | Merrimack |
| Location | 4.6 Mi From Wilmot Tl |
| Carries | US 4 |
| Crosses | Smith River |
| Coordinates | 43.52990, -71.86989 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 6 (Satisfactory) |
| Superstructure | 4 (Poor) |
| Substructure | 4 (Poor) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Girder and Floorbeam |
| Total Length | 69.9 ft (21.3 m) |
| Max Span | 63.0 ft (19.2 m) |
| Deck Width | 26.6 ft (8.1 m) |
| Deck Area | 172.5 sq m |
| Main Spans | 1 |
| Year Built | 1929 (reconstructed 1991) |
Traffic
| Avg Daily Traffic | 2,087 (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 | 005801380009400 |