Porter Road over Wild Ammonoosuc River
Fair Condition177 years old529 vehicles/day
Location
| State | New Hampshire |
| County | Grafton |
| Location | 340 Feet Fr Nh 112 |
| Carries | Porter Road |
| Crosses | Wild Ammonoosuc River |
| Coordinates | 44.13381, -71.95089 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Wood or Timber |
| Design | Truss - Thru |
| Total Length | 160.1 ft (48.8 m) |
| Max Span | 137.1 ft (41.8 m) |
| Deck Width | 17.1 ft (5.2 m) |
| Deck Area | 253.8 sq m |
| Main Spans | 2 |
| Year Built | 1849 (reconstructed 1999) |
Traffic
| Avg Daily Traffic | 529 (2023) |
| Truck Traffic | 4% |
| Lanes On Bridge | 1 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | City/Municipal Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Structure Number | 001801630005300 |