| 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 |
10 Mile Road Bridge
|
 | 10 Mile Road Over Charlotte River | Rural: Chippewa County, Michigan | Metal 3 Panel Rivet-Connected Warren Pony Truss, Fixed |
Total Length: 51.8 ft Main Span Length: 50.9 ft Roadway Width: 16.1 ft Main Spans: 1 |
1914 By: Minneapolis Bridge Company of Minneapolis, Minnesota | A rare example of a lightweight style pony truss. | 
|
Ashmun Street Bridge
|
 | Ashmun Street (I-75 BS) Over Power Canal | Sault Ste Marie: Chippewa County, Michigan | Metal Braced Ribbed Through Arch, Fixed |
Total Length: 257 ft Main Span Length: 257 ft Roadway Width: 42 ft Main Spans: 1 |
1935 By: Fry and Cain | One of the most beautiful and rarest bridges in Michigan, this unique, massive trussed steel arch bridge provides an impressive clear span over the canal. | 
|
Dafter Road Bridge
|
 | Dafter Road Over I-75 | Rural: Chippewa County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 357 ft Main Span Length: 78.7 ft Roadway Width: 24 ft Main Spans: 6 |
1964 By: Pierson Contracting Company and Raff and Dexter of Lansing, Michigan and Michigan State Highway Department | Featuring unusual steel bent supports, this is a smaller and more modified version of the M-48 Bridge also in this county. | 
|
East Portage Avenue Bridge
|
 | East Portage Avenue Over Power Canal | Sault Ste. Marie: Chippewa County, Michigan | Metal Tied Solid Ribbed Through Arch, Fixed |
Total Length: 264.8 ft Main Span Length: 264.8 ft Roadway Width: 45 ft Main Spans: 1 |
1970 By: American Bridge Company of New York, New York | One of two identical arch bridges in Sault Ste Marie. | 
|
Fort Street Bridge
|
 | Fort Street Over Power Canal | Sault Ste. Marie: Chippewa County, Michigan | Metal Pin-Connected Pennsylvania Through Truss, Fixed |
Total Length: 234 ft Main Span Length: 232 ft Main Spans: 1 |
1902 By: New Castle Bridge Company of New Castle, Indiana | A gorgeous example of its type, this is one of only two Pennsylvania truss bridges in Michigan. | 
|
International Bridge
|
 | I-75 / TC-17B Over St. Marys River and Associated Canal System | Sault Ste. Marie: Chippewa County, Michigan and Algoma District, Ontario | Metal Cantilever (Suspended Deck) Bolt-Connected Warren Through Truss, Fixed and Approach Spans: Metal 8 Panel Bolt-Connected Warren Deck Truss, Fixed |
Total Length: 9280.6 ft Main Span Length: 430 ft Roadway Width: 28 ft Main Spans: 7 |
1962 By: Unknown and Steinman, Boynton, Gronquist and London of New York, New York | This is the monumental 2 3/4 Mile long highway bridge in Sault Ste Marie. | 
|
International Railroad Bridge
Camelback Truss Bridge Spans |
| Railroad (Wisconsin Central) Over St. Marys River and Associated Canal System | Sault Ste. Marie: Chippewa County, Michigan and Algoma District, Ontario | Metal 8 Panel Pin-Connected Camelback Through Truss, Fixed |
Total Length: 2151 ft Main Span Length: 239 ft Main Spans: 9 |
1887 By: Dominion Bridge Company of Montréal, Québec | This is the stationary multi-span Parker truss portion of the magnificent, monumental International Railroad Bridge. | 
|
International Railroad Bridge
Swing Bridge Span |
| Railroad (Wisconsin Central) Over St. Marys River and Associated Canal System | Sault Ste. Marie: Chippewa County, Michigan and Algoma District, Ontario | Metal Pin-Connected Baltimore Through Truss, Movable: Swing (Rim Bearing Center Pier) | Main Spans: 2 | 1887 By: Dominion Bridge Company of Montréal, Québec | This is the swing span portion of the magnificent, monumental International Railroad Bridge. | 
|
International Railroad Bridge
Vertical Lift Bridge Span |
 | Railroad (Wisconsin Central) Over St. Marys River and Associated Canal System | Sault Ste. Marie: Chippewa County, Michigan and Algoma District, Ontario | Metal 14 Panel Rivet-Connected Polygonal Warren Through Truss, Movable: Vertical Lift |
Total Length: 369 ft Main Span Length: 369 ft Roadway Width: 21 ft Main Spans: 1 |
1960 By: Unknown | With 175 foot towers and 70 ton counterweights, this is the vertical lift span portion of the magnificent, monumental International Railroad Bridge. | 
|
International Railroad Bridge
Bascule Bridge Span |
 | Railroad (Wisconsin Central) Over St. Marys River and Associated Canal System | Sault Ste. Marie: Chippewa County, Michigan and Algoma District, Ontario | Metal Rivet-Connected Pennsylvania Through Truss, Movable: Bascule (Heel Trunnion) |
Total Length: 336 ft Main Span Length: 336 ft Roadway Width: 23 ft Main Spans: 1 |
1913 By: Pennsylvania Steel Company of Steelton, Pennsylvania and Strauss Bascule Bridge Company of Chicago, Illinois | Designed by Strauss Bascule Bridge Company, this is the bascule span portion of the magnificent, monumental International Railroad Bridge. | 
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M-123 Bridge
|
 | M-123 Over Tahquamenon River | Rural: Chippewa County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 280 ft Main Span Length: 60 ft Roadway Width: 24 ft Main Spans: 5 |
1952 By: Proksch Construction Company and Michigan State Highway Department | An uncommon and relatively long variation of a state highway department steel stringer bridge. | 
|
M-28 Bridge
|
 | M-28 Over East Branch Tahquemenon River | Rural: Chippewa County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 54.8 ft Main Span Length: 54.8 ft Roadway Width: 30 ft Main Spans: 1 |
1926 By: Walter Toebe Company and Michigan State Highway Department | This prototype bridge is significant as one of the first examples of a short-lived but prolific state standard plan. | 
|
M-48 Bridge
|
 | M-48 Over I-75 | Rural: Chippewa County, Michigan | Metal Stringer (Multi-Beam), Fixed |
Total Length: 673 ft Main Span Length: 72 ft Roadway Width: 28 ft Main Spans: 12 |
1963 By: Gilliland Construction Company and Michigan State Highway Department | This is an extremely unusual expressway overpass that features beam approach spans supported by v-laced and riveted steel bents! | 
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Riverside Drive Bridge
|
| Riverside Drive Over Frechette Creek | Rural: Chippewa County, Michigan | Metal Stringer (Multi-Beam), Fixed | Main Spans: 1 | By: Unknown | This tiny bridge is noted for its unusual concrete railing. | 
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West Portage Avenue Bridge
|
| West Portage Avenue (I-75 BS) Over Power Canal | Sault Ste. Marie: Chippewa County, Michigan | Metal Tied Solid Ribbed Through Arch, Fixed |
Total Length: 264.8 ft Main Span Length: 264.8 ft Roadway Width: 45 ft Main Spans: 1 |
1970 By: American Bridge Company of New York, New York | One of two identical arch bridges in Sault Ste Marie. | 
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