Circumferential WB over Merrimack River Csx
Good Condition53 years old50,841 vehicles/day
Location
| State | New Hampshire |
| County | Hillsborough |
| Location | Nashua-hudson Tl |
| Carries | Circumferential WB |
| Crosses | Merrimack River Csx |
| Coordinates | 42.72427, -71.43832 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 772.0 ft (235.3 m) |
| Max Span | 215.9 ft (65.8 m) |
| Deck Width | 62.0 ft (18.9 m) |
| Deck Area | 4447.2 sq m |
| Main Spans | 4 |
| Year Built | 1973 (reconstructed 1999) |
Traffic
| Avg Daily Traffic | 50,841 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 3 |
Inspection & Ownership
| Last Inspection | 424 |
| Inspection Frequency | Every 24 months |
| Owner | State Toll Authority |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Structure Number | 017701570005900 |