US 4 over Blackwater River
Fair Condition93 years old2,172 vehicles/day
Location
| State | New Hampshire |
| County | Merrimack |
| Location | 1.7 Mi From Salisbury Tl |
| Carries | US 4 |
| Crosses | Blackwater River |
| Coordinates | 43.43227, -71.80094 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete |
| Design | Tee Beam |
| Total Length | 63.0 ft (19.2 m) |
| Max Span | 56.1 ft (17.1 m) |
| Deck Width | 29.5 ft (9 m) |
| Deck Area | 172.8 sq m |
| Main Spans | 1 |
| Year Built | 1933 |
Traffic
| Avg Daily Traffic | 2,172 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 524 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Structure Number | 000801200009200 |