| 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 |
17 Sideroad Bridge
Happy Valley Bridge |
 | 17 Sideroad Over Pine River | Rural: Dufferin County, Ontario | Concrete Rainbow Through Arch, Fixed | Main Spans: 1 | By: Unknown | This is a small but attractive and unaltered concrete bowstring arch bridge. | 
|
4 3/4 Mile Road Bridge
|
 | 4 3/4 Mile Road Over Pine River | Rural: Midland County, Michigan | Metal 8 Panel Pin-Connected Pratt Through Truss, Fixed |
Total Length: 120 ft Main Span Length: 116 ft Roadway Width: 15 ft Main Spans: 1 |
1903 By: Tunnel City Bridge and Iron Works of Port Huron, MI | The only known bridge built by the Tunnel City Bridge and Iron Works was relocated to a private subdivision. | 
|
Bryce Road Bridge
|
 | Bryce Road Over Pine River | Rural: St. Clair County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 82 ft Main Span Length: 38.7 ft Roadway Width: 22 ft Main Spans: 2 |
1923 By: Unknown | This relatively old steel stringer bridge is skewed and features good historic integrity. | 
|
Charlevoix Bridge
|
 | US-31 (Michigan Avenue / Bridge Street) Over Pine River | Charlevoix: Charlevoix County, Michigan | Metal Deck Girder, Movable: Bascule and Approach Spans: Metal Stringer (Multi-Beam), Fixed |
Total Length: 222.8 ft Main Span Length: 111 ft Roadway Width: 44 ft Main Spans: 1 |
1948 By: L. W. Lamb Company of Jackson, Michigan and Hazelet and Erdal of Chicago, Illinois | A classic Michigan plate girder bascule bridge with unusual altered guardrails. | 
| X |
Fred Moore Highway Bridge
|
 | Fred Moore Highway Over Pine River | St. Clair: St. Clair County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 180 ft Main Span Length: 59.7 ft Roadway Width: 37 ft Main Spans: 3 |
1960 By: Unknown and Michigan State Highway Department | Although its superstructure was considered satisfactory by the national bridge inventory at the time, this bridge was demolished. | 
| S |
Frith Road Bridge
Fitzgerald Road Bridge |
 | Frith Road Over Pine River | Rural: St. Clair County, Michigan | Metal 7 Panel Pin-Connected Pratt Through Truss, Fixed and Approach Spans: Wood Stringer (Multi-Beam), Fixed |
Total Length: 179 ft Main Span Length: 112 ft Roadway Width: 16 ft Main Spans: 1 |
By: Unknown | This attractive and historic through truss bridge was a local treasure that is now in storage awaiting relocation and reuse. | 
| ! |
Gratiot Avenue Pine River Bridge
|
 | Gratiot Avenue Over Pine River | Rural: St. Clair County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 123 ft Main Span Length: 58.7 ft Roadway Width: 40 ft Main Spans: 2 |
1931 By: E. C. Nolan and Son of Detroit, Michigan and Michigan State Highway Department | A remnant of the US-25 days of Gratiot Avenue, this bridge displays the width of a road that was once three lanes rather than two. | 
|
Griswold Road Bridge
|
| Griswold Road Over Pine River | Rural: St. Clair County, Michigan | Concrete 90 Foot Plan Curved Chord Through Girder, Fixed |
Total Length: 90 ft Main Span Length: 84 ft Roadway Width: 22 ft Main Spans: 1 |
1925 By: Unknown and Michigan State Highway Department | Although the deck was repaired, this once-proud structure has experienced severe spalling of its concrete girders. | 
|
Old Fred Moore Highway Bridge
|
 | Fred Moore Highway (Old Alignment) Over Pine River | St. Clair: St. Clair County, Michigan | Concrete Deck Girder, Fixed | Main Spans: 3 | By: Unknown | An attractive and very unusual design in Michigan, this bridge now serves a bike path, with modern guardrails ruining the originals. | 
|
Pine River CN Railroad Bridge
|
 | Railroad (Canadian National) Over Pine River | Rural: St. Clair County, Michigan | Metal Deck Girder, Fixed | Main Spans: 2 | By: Unknown | A two span deck plate girder with many modifications | 
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