| 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 |
Mumma Ford Bridge
|
 | Mumma Ford Road Over Monocacy River | Rural: Frederick County, Maryland and Carroll County, Maryland | Metal 6 Panel Pin-Connected Pratt Through Truss, Fixed |
Total Length: 229 ft Main Span Length: 114 ft Roadway Width: 12.5 ft Main Spans: 2 |
1911 By: York Bridge Company of York, Pennsylvania | This two-span truss had an arch retrofit added to the superstructure. | 
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Sixes Bridge
|
 | Sixes Bridge Road Over Monocacy River | Rural: Frederick County, Maryland and Carroll County, Maryland | Metal 7 Panel Pin-Connected Pratt Through Truss, Fixed |
Total Length: 240 ft Main Span Length: 119 ft Roadway Width: 15 ft Main Spans: 2 |
1910 By: York Bridge Company of York, Pennsylvania | A very photogenic two-span through truss bridge. | 
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