I-93 SB over Mirror Lake Road
Good Condition56 years old7,263 vehicles/day
Location
| State | New Hampshire |
| County | Grafton |
| Location | 0.24 Mi Thornton Tl |
| Carries | I-93 SB |
| Crosses | Mirror Lake Road |
| Coordinates | 43.93846, -71.68857 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 75.1 ft (22.9 m) |
| Max Span | 68.9 ft (21 m) |
| Deck Width | 44.9 ft (13.7 m) |
| Deck Area | 313.7 sq m |
| Main Spans | 1 |
| Year Built | 1970 (reconstructed 2002) |
Traffic
| Avg Daily Traffic | 7,263 (2023) |
| Truck Traffic | 10% |
| Lanes On Bridge | 2 |
| Lanes Under 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 | 028402010003400 |