I-93 SB over Mad River
Good Condition58 years old10,052 vehicles/day
Location
| State | New Hampshire |
| County | Grafton |
| Location | 4.2 Mi Plymouth Tl |
| Carries | I-93 SB |
| Crosses | Mad River |
| Coordinates | 43.83881, -71.65121 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 104.7 ft (31.9 m) |
| Max Span | 100.1 ft (30.5 m) |
| Deck Width | 44.3 ft (13.5 m) |
| Deck Area | 430.6 sq m |
| Main Spans | 1 |
| Year Built | 1968 (reconstructed 2003) |
Traffic
| Avg Daily Traffic | 10,052 (2023) |
| Truck Traffic | 10% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 423 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 003501330011500 |