| 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 | ! |
Townhall Road Bridge
Grout Road Bridge |
 | Townhall Road (Grout Road) Over South Branch Tobacco River | Rural: Gladwin County, Michigan | Metal 4 Panel Rivet-Connected Warren Pony Truss, Fixed |
Total Length: 67 ft Main Span Length: 65 ft Roadway Width: 14 ft Main Spans: 1 |
1917 By: H. Stewart | This truss bridge retains excellent historic integrity in a region with very few historic bridges. | 
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Wirtz Road Bridge
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 | Wirtz Road Over Sugar River | Rural: Gladwin County, Michigan | Metal 4 Panel Rivet-Connected Warren Pony Truss, Fixed |
Total Length: 50 ft Main Span Length: 48 ft Roadway Width: 12.8 ft Main Spans: 1 |
1920 By: Unknown | A regionally rare example of a metal truss bridge, this structure is abandoned and overgrown. | 
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