| 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
|
 | 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. | 
|
Lower Rollstone Street Bridge
|
| Lower Rollstone Street Over Nashua River | Fitchburg: Worcester County, Massachusetts | Metal 11 Panel Pin-Connected Bowstring Pony Truss, Fixed |
Total Length: 111 ft Main Span Length: 105 ft Roadway Width: 26.6 ft Main Spans: 1 |
1870 By: National Bridge Company of Boston, Massachusetts | This distinctive bridge is an extremely rare and significant example of the important design ideas of the Parker patent truss bridge. | 
|
Ponakin Bridge
|
 | Ponakin Road Over Nashua River | Ponakin Mill: Worcester County, Massachusetts | Metal 11 Panel Pin-Connected Post Through Truss, Fixed |
Total Length: 101 ft Main Span Length: 100 ft Roadway Width: 20.3 ft Main Spans: 1 |
1871 By: Watson Manufacturing Company of Paterson, New Jersey | One of the rarest truss bridges in the country, a cast iron Post truss sits abandoned and should be restored at all costs. | 
|
Rollstone Street Bridge
|
 | Rollstone Street Over Nashua River | Fitchburg: Worcester County, Massachusetts | Metal Rivet-Connected Pratt Deck Truss, Fixed |
Total Length: 176.8 ft Main Span Length: 86 ft Roadway Width: 26 ft Main Spans: 2 |
1909 By: Unknown | This two-span deck truss appears to be in good condition. | 
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