| 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 |
Aitken Road Bridge
|
 | Aitken Road Over Black River | Rural: Sanilac County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 128 ft Main Span Length: 63 ft Roadway Width: 20 ft Main Spans: 2 |
1950 By: Unknown | This beam bridge, having had its railings replaced, was mainly noted for a highly unusual concrete pier. | 
| S |
Cash Road Bridge
|
 | Cash Road Over Elk Creek | Cash (Rural): Sanilac County, Michigan | Metal 5 Panel Rivet-Connected Warren Pony Truss, Fixed |
Total Length: 72.8 ft Main Span Length: 70 ft Roadway Width: 15.4 ft Main Spans: 1 |
1910 By: Unknown | This wooden deck warren pony truss was moved to private property. | 
| X |
Church Road Bridge
|
 | Church Road Over Black River | Rural (Near Carsonville): Sanilac County, Michigan | Metal 6 Panel Rivet-Connected Pratt Through Truss, Fixed |
Total Length: 99 ft Main Span Length: 96 ft Roadway Width: 15.8 ft Main Spans: 1 |
By: Continental Bridge Company of Chicago and Peotone, Illinois | Sanilac County chose to demolish their last through truss, which was located a quiet rural road. | 
|
Croswell Swinging Bridge
|
 | Park Path Over Black River | Croswell: Sanilac County, Michigan | Metal Swinging Wire Cable Suspension, Fixed | Main Spans: 1 | 1905 By: Unknown | A strange, heavily modified bridge is one of the few remaining historic bridges in the county. | 
|
Fox Road Bridge
|
| Fox Road Over Elk Creek | Rural: Sanilac County, Michigan | Metal 3 Panel Rivet-Connected Queenpost Pony Truss, Fixed | Main Spans: 1 | By: Unknown | This unusual queenspost-like bridge has only been spared demolition because it is on an abandoned section of road. | 
| X |
Galbraith Line Bridge
|
 | Galbraith Line Over Black River | Rural: Sanilac County, Michigan | Metal Through Girder, Fixed | Main Spans: 3 | By: Unknown | A memorial page to a rare bridge: a large highway plate girder. | 
| X |
M-46 Bridge
|
 | M-46 (Sanilac Road) Over South Branch Cass River | Rural: Sanilac County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 80 ft Main Span Length: 40 ft Roadway Width: 30 ft Main Spans: 2 |
1930 By: Unknown and Michigan State Highway Department | Although modern railings were mounted in front of the originals, this is still a decent bridge. | 
|
M-90 Bridge
Peck Road Bridge |
| M-90 (Peck Road) Over Black River | Croswell: Sanilac County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 198.8 ft Main Span Length: 72.8 ft Roadway Width: 38 ft Main Spans: 3 |
1947 By: F. C. Atletwed and Michigan State Highway Department | One of the last remaining historic bridges of any kind in Sanilac County. | 
| X |
Nicol Road Bridge
|
| Nicol Road Over Black River | Rural: Sanilac County, Michigan | Metal 4 Panel Rivet-Connected Warren Pony Truss, Fixed |
Total Length: 70 ft Main Span Length: 66 ft Roadway Width: 20 ft Main Spans: 1 |
1905 By: Unknown | The last public truss bridge in Sanilac County, this structure was demolished, despite its remarkably excellent truss condition. | 
|
Todd Road Private Bridge
Black Creek Private Bridge |
 | Private Walkway Over Black Creek | Rural: Sanilac County, Michigan | Metal Rivet-Connected Double-Intersection Warren Pony Truss, Fixed | Main Spans: 1 | By: Unknown | A rare example of a lightweight double-Warren pony truss bridge. | 
|
Turntable Bridge
|
 | Railroad (Abandoned) Over Black River | Rural: Sanilac County, Michigan | Metal Deck Girder, Fixed | Main Spans: 1 | 1926 By: American Bridge Company of New York, New York | This fascinating bridge's main span is a reused railroad turntable! | 
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