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Swiftwater Covered Bridge
Grafton County, New Hampshire · over the Wild Ammonoosuc River · built 1849
| Item | Of record | Source |
|---|---|---|
| Crosses | Wild Ammonoosuc River | National Bridge Inventory, 2025 file |
| Road carried | Porter Road | National Bridge Inventory, 2025 file |
| Carries | Vehicle bridge (public road) | As recorded — see access notes below |
| Year built | 1849 | National Bridge Inventory, 2025 file |
| Length | 160 ft | National Bridge Inventory structure length, out-to-out, 2025 file |
| Longest span | 137 ft | National Bridge Inventory, 2025 file |
| Vertical clearance | 10 ft 2 in | National Bridge Inventory minimum vertical clearance over the roadway, as recorded (converted from metres) |
| Coordinates | 44.13428, -71.95091 Google Maps · OpenStreetMap | National Park Service, National Register GIS |
| Historic listing | National Register of Historic Places, listed 1976-11-21 (reference #76000127) | National Park Service |
| How it qualifies | Listed on the National Register of Historic Places as a covered bridge | See About & method |
Access & restrictions — as recorded
Posted for load
| Posting appraisal | Operating rating more than 30% below the maximum legal load |
| Structural operating rating (not the posted limit) | 10.9 metric tons (about 12 US tons) |
| Vertical clearance | 10 ft 2 in |
Source: FHWA National Bridge Inventory, 2025 annual file; record inspected Oct 2024. The record’s inspection date is Oct 2024. Status checked November 12, 2026. The posted limit itself is set by the owning agency and shown on signs at the bridge; it is not a field in the federal record, so it is not printed here. Postings and closures change — obey the signs at the bridge.