| 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 |
Bay City Railroad Bridge
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 | Railroad (Central Michigan Railroad) Over Saginaw River | Bay City: Bay County, Michigan | Metal Rivet-Connected Pratt Through Truss, Movable: Swing (Center Pier) |
Total Length: 660 ft Main Span Length: 245 ft Main Spans: 1 |
1905 By: Unknown | One of two railroad swing bridges in Bay City. | 
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Detroit and Mackinac Railroad Bridge
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 | Railroad (Detroit and Mackinac) Over Saginaw River | Bay City: Bay County, Michigan | Metal Pin-Connected Pratt Through Truss, Movable: Swing (Center Pier) and Approach Spans: Metal Rivet-Connected Pratt Through Truss, Fixed |
Total Length: 740 ft Main Span Length: 260 ft Roadway Width: 15 ft Main Spans: 1 |
1892 By: Unknown | One of two railroad swing bridges in Bay City, this is the last bridge before Saginaw River empties into Saginaw Bay. | 
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