| 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 |
M-72 Au Sable River Bridge
State Street Bridge |
 | M-72 (I-75 BL) Over Au Sable River | Grayling: Crawford County, Michigan | Metal Rigid-Frame, Fixed |
Total Length: 40 ft Main Span Length: 40 ft Roadway Width: 40 ft Main Spans: 1 |
1935 By: F. C. Atletwed and Michigan State Highway Department | This small bridge is the only example of a steel rigid frame bridge in Michigan. | 
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