| 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 |
Bollman Bridge
|
 | Railroad (Rail-Trail) Over Scratch Hill Road | Glade City (Rural): Somerset County, Pennsylvania | Metal 6 Panel Pin-Connected Warren Through Truss, Fixed |
Total Length: 81 ft Main Span Length: 81 ft Roadway Width: 13 ft Main Spans: 1 |
1871 By: Wendel Bollman of Baltimore, Maryland | An extremely rare cast iron bridge and one of the last surviving bridges that were designed by the famous Baltimore and Ohio Railroad Chief Engineer. | 
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Bollman Truss Railroad Bridge
|
 | Railroad (Abandoned Baltimore and Ohio, Rail-Trail) Over Little Patuxent River | Savage: Howard County, Maryland | Metal 6 Panel Pin-Connected Bollman Through Truss, Fixed |
Total Length: 159 ft Main Span Length: 79.5 ft Roadway Width: 25.5 ft Main Spans: 2 |
1869 By: Wendel Bollman of Baltimore, Maryland | This is the last Bollman truss remaining, and was the first iron bridge design built with frequency by the railroads. | 
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Salisbury Street Bridge
|
 | Salisbury Street Over Chesapeake and Ohio Canal | Williamsport: Washington County, Maryland | Metal 8 Panel Pin-Connected Pratt Full-Slope Pony Truss, Fixed and Approach Spans: Metal Stringer (Multi-Beam), Fixed |
Total Length: 107.3 ft Main Span Length: 67 ft Roadway Width: 9.5 ft Main Spans: 1 |
1879 By: Wendel Bollman of Baltimore, Maryland | A rare surviving work of noted engineer Wendel Bollman, this is a very old metal truss bridge. | 
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