| 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 |
General Sullivan Bridge
Little Bay Bridge |
 | Non-Motorized Path (Old US-4 Alignment) Over Little Bay | Portsmouth and Dover: Rockingham County, New Hampshire and Strafford County, New Hampshire | Metal Continuous (Arched) Rivet-Connected Polygonal Warren Through Truss, Fixed and Approach Spans: Metal Rivet-Connected Polygonal Warren Deck Truss, Fixed |
Total Length: 1585 ft Main Span Length: 275 ft Roadway Width: 24 ft Main Spans: 1 |
1934 By: Unknown and Fay, Spofford, and Thorndike of Boston, Massachusetts | This bridge is one of the only surviving early examples of its kind. | 
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