| Special Bridge Conditions Legend |
| ! | Confirmed demolition date within one year or an especially historic bridge that is threatened with demolition at any level. |
| X | The bridge has been confirmed demolished or collapsed. |
| S | The bridge has been dismantled or moved to an offsite location and is not currently available for public viewing. |
| L | Most or all of the original bridge material has been demolished and replaced, including historically significant elements, but some original parts of the bridge remain. |
| Note: This website cannot guarantee the current condition of any bridge on this website. Bridges lacking these icons should not necessarily be considered condition-free. |
| Bridge Name | HSR Rating | Facility Carried / Feature Intersected | Location | Structure Type | Structure Dimensions | Construction Date / Builder or Contractor | Description | Thumbnail | ! |
Boscawen - Canterbury Bridge
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 | Depot Street (West Road) Over Merrimack River | Boscawen and Canterbury: Merrimack County, New Hampshire | Metal 9 Panel Rivet-Connected Parker Through Truss, Fixed |
Total Length: 347 ft Main Span Length: 170 ft Roadway Width: 17.4 ft Main Spans: 2 |
1907 By: American Bridge Company of New York, New York and John W. Storrs of Concord, New Hampshire | This unaltered bridge was the oldest example of its type in the entire state of New Hampshire. | 
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Edna Dean Proctor Bridge
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 | NH-114 (Bridge Street) Over Contoocook River | Henniker: Merrimack County, New Hampshire | Concrete Closed Spandrel Deck Arch, Fixed |
Total Length: 118 ft Main Span Length: 54.5 ft Roadway Width: 31.2 ft Main Spans: 2 |
1939 By: Unknown | This is a concrete arch bridge that is faced in stone to make it look like a stone arch bridge. | 
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