US 4 over Merrimack River
Good Condition21 years old15,071 vehicles/day
Location
| State | New Hampshire |
| County | Merrimack |
| Location | Canterbury T.l. |
| Carries | US 4 |
| Crosses | Merrimack River |
| Coordinates | 43.28986, -71.58795 |
Condition Ratings
| Overall Condition | Good |
| Deck | 8 (Very Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 592.8 ft (180.7 m) |
| Max Span | 129.9 ft (39.6 m) |
| Deck Width | 56.1 ft (17.1 m) |
| Deck Area | 3090.0 sq m |
| Main Spans | 4 |
| Year Built | 2005 |
Traffic
| Avg Daily Traffic | 15,071 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 723 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 002601420003800 |