| 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 | X |
Hillman Bridge
M-32 Spur Bridge |
 | M-32 Spur (State Street) Over Thunder Bay River | Hillman: Montmorency County, Michigan | Concrete 75 Foot Plan Curved Chord Through Girder, Fixed |
Total Length: 150 ft Main Span Length: 74.8 ft Roadway Width: 20 ft Main Spans: 2 |
1922 By: Unknown and Michigan State Highway Department | Although nationally significant as the last of its kind, MDOT demolished this beautiful bridge. | 
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Sturgis Road Bridge
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 | Sturgis Road Over Thunder Bay River | Rural: Montmorency County, Michigan | Metal 3 Panel Rivet-Connected Warren Pony Truss, Fixed | Main Spans: 1 | By: Groton Bridge Company of Groton, New York | This bridge and the road it serves are no longer open to vehicular traffic, but have been turned into a non-motorized trail. | 
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Ulshaffer Road Bridge
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| Ulshaffer Road Over Thunder Bay River | Rural: Montmorency County, Michigan | Metal 4 Panel Pin-Connected Pratt Half-Hip Pony Truss, Fixed |
Total Length: 70 ft Main Span Length: 40 ft Roadway Width: 15.7 ft Main Spans: 1 |
By: Unknown | A secluded pony truss with interesting beams under the deck. | 
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