| 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 |
Loudon Railroad Bridge
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 | Railroad (Norfolk Southern) Over Tennessee River (Watts Bar Lake) | Loudon: Loudon County, Tennessee | Metal 12 Panel Bolt-Connected Polygonal Warren Through Truss, Fixed and Approach Spans: Metal Deck Girder, Fixed | Main Spans: 1 | By: Unknown | This bridge appears to be a very late example of a metal truss bridge and is noted for its simple span length. | 
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