| 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 |
Amasa Railroad Bridge
|
 | Railroad (Soo Line) Over Hemlock River | Amasa: Iron County, Michigan | Metal 8 Panel Rivet-Connected Warren Pony Truss, Fixed | Main Spans: 1 | 1920 By: Unknown | This uncommon example of a railroad pony truss has massive members. | 
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Brule River Railroad Bridge
|
 | Railroad (Rail-Trail) Over Brule River | Rural: Iron County, Michigan and Florence County, Wisconsin | Metal 8 Panel Rivet-Connected Double-Intersection Warren Deck Truss, Fixed and Approach Spans: Metal Deck Girder, Fixed | Main Spans: 1 | By: Unknown | A good example of a Chicago and NorthWestern Railroad Bridge. | 
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Chicagon Mine Road Bridge
|
 | Chicagon Mine Road Over Chicagon Creek | Rural: Iron County, Michigan | Concrete Slab, Fixed |
Total Length: 28 ft Main Span Length: 25 ft Roadway Width: 15 ft Main Spans: 1 |
1910 By: Unknown | This small, simple, and unaltered bridge is the oldest known concrete slab bridge in Michigan. | 
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Genesee Street Bridge
|
 | Genesee Street (Old US-2) Over Iron River | Iron River: Iron County, Michigan | Concrete Closed Spandrel Deck Arch, Fixed |
Total Length: 90 ft Main Span Length: 90 ft Roadway Width: 45 ft Main Spans: 1 |
1917 By: Hoose and Person Construction Company of Iron Mountain, Michigan and Michigan State Highway Department | This is an unaltered and fairly early example of a concrete arch bridge in Michigan, and it is a remnant of the former US-2 alignment. | 
|
M-69 Paint River Bridge
Superior Avenue Bridge |
| M-69 (Superior Avenue) Over Paint River | Rural: Iron County, Michigan | Concrete Open Spandrel Deck Arch, Fixed |
Total Length: 261.8 ft Main Span Length: 131 ft Roadway Width: 26 ft Main Spans: 2 |
1924 By: Smith-Holmes-Burridge-Sparks of Houghton, Michigan and Michigan State Highway Department | This bridge is a good example of a compromise preservation solution. | 
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Old US-141 Bridge
|
| Old US-141 Over Hemlock River | Amasa: Iron County, Michigan | Concrete 60 Foot Plan Curved Chord Through Girder, Fixed |
Total Length: 60 ft Main Span Length: 60 ft Roadway Width: 21 ft Main Spans: 1 |
1924 By: Samuel Mills of Escanaba, Michigan and Michigan State Highway Department | This bridge is a great and increasingly rare example of a concrete camelback bridge that deserves preservation. | 
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Pentoga Road Bridge
|
 | Pentoga Road (Cherry Avenue) Over Brule River | Pentoga: Iron County, Michigan and Florence County, Wisconsin | Metal 4 Panel Rivet-Connected Warren Pony Truss, Fixed |
Total Length: 64 ft Main Span Length: 60 ft Roadway Width: 16 ft Main Spans: 1 |
1924 By: Unknown | This pony truss, a locally rare bridge type, has had some unusual alterations. | 
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