I-89 SB over Silk Farm Road
Good Condition67 years old20,412 vehicles/day
Location
| State | New Hampshire |
| County | Merrimack |
| Location | .5 Mi N. Of Jct. Rt. 13 |
| Carries | I-89 SB |
| Crosses | Silk Farm Road |
| Coordinates | 43.18271, -71.57426 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 169.0 ft (51.5 m) |
| Max Span | 71.9 ft (21.9 m) |
| Deck Width | 57.1 ft (17.4 m) |
| Deck Area | 896.1 sq m |
| Main Spans | 3 |
| Year Built | 1959 (reconstructed 1993) |
Traffic
| Avg Daily Traffic | 20,412 (2023) |
| Truck Traffic | 6% |
| Lanes On Bridge | 3 |
| Lanes Under Bridge | 2 |
Inspection & Ownership
| Last Inspection | 523 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 005201750005100 |