| 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 |
St. George River Railroad Bridge
Thomaston Railroad Bridge |
 | Railroad (Maine Eastern) Over St. George River | Near Thomaston: Knox County, Maine | Metal Through Girder, Movable: Bascule (Rolling Lift) and Approach Spans: Metal 6 Panel Rivet-Connected Warren Through Truss, Fixed | Main Spans: 1 | By: Unknown | This multi-span bridge contains a variety of structure types. | 
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Wadsworth Street Bridge
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 | Wadsworth Street (Brooklyn Heights Road) Over St. George River | Thomaston: Knox County, Maine | Metal 4 Panel Rivet-Connected Pratt Pony Truss, Movable: Bascule (Belidor) and Approach Spans: Metal 7 Panel Rivet-Connected Pratt Through Truss, Fixed |
Total Length: 231 ft Roadway Width: 20 ft Main Spans: 1 |
1925 By: Boston Bridge Works of Boston, Massachusetts | Although all machinery has been removed, this bridge is one of the only examples in the country of a belidor type bascule bridge. | 
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