| 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 |
Atherton Bridge
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 | Bolton Road (Old Alignment) Over Nashua River | Lancaster: Worcester County, Massachusetts | Metal 11 Panel Pin-Connected Post Through Truss, Fixed |
Total Length: 72 ft Main Span Length: 72 ft Roadway Width: 18.5 ft Main Spans: 1 |
1870 By: J. H. Cofrode and Company of Philadelphia, Pennsylvania | One of two Post truss bridges in the country, this Phoenix Column pony truss should be restored. | 
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