US 4 over Blackwater River
Poor Condition93 years old2,652 vehicles/day
Location
| State | New Hampshire |
| County | Merrimack |
| Location | 0.3 Mi From Salisbury Tl |
| Carries | US 4 |
| Crosses | Blackwater River |
| Coordinates | 43.42182, -71.77684 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 4 (Poor) |
| Superstructure | 3 (Serious) |
| Substructure | 5 (Fair) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Girder and Floorbeam |
| Total Length | 75.1 ft (22.9 m) |
| Max Span | 66.9 ft (20.4 m) |
| Deck Width | 26.6 ft (8.1 m) |
| Deck Area | 185.5 sq m |
| Main Spans | 1 |
| Year Built | 1933 |
Traffic
| Avg Daily Traffic | 2,652 (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 | 000801430007700 |