| 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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Sarah Mildred Long Bridge
|
 | US-1 Bypass and Railroad (Boston and Maine) Over Piscataqua River | Portsmouth and Kittery: Rockingham County, New Hampshire and York County, Maine | Metal 8 Panel Rivet-Connected Warren Deck Truss, Movable: Vertical Lift and Approach Spans: Metal Deck Girder, Movable: Retractile |
Total Length: 2804 ft Main Span Length: 227 ft Roadway Width: 30 ft Main Spans: 1 |
1940 By: Phoenix Bridge Company of Phoenixville, Pennsylvania and Harrington and Cortelyou | This unique bridge has an unusual design of vertical lift, but its approach span that is a retractile type movable bridge is exceedingly rare. | 
| X |
World War Memorial Bridge
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| US-1 Over Piscataqua River | Portsmouth and Kittery: Rockingham County, New Hampshire and York County, Maine | Metal 10 Panel Rivet-Connected Warren Through Truss, Movable: Vertical Lift and Approach Spans: Metal 10 Panel Rivet-Connected Polygonal Warren Through Truss, Fixed |
Total Length: 1201 ft Main Span Length: 297 ft Roadway Width: 28 ft Main Spans: 1 |
1923 By: American Bridge Company of New York, New York and J. A. L. Waddell | A memorial to soliders, this rare and technologically significant landmark historic bridge was demolished. | 
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