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Historic Bridges: Ontonagon County, Michigan

Special Bridge Conditions Legend: R - Former location of relocated bridge. ! - At risk for demolition or destruction. X - Confirmed demolished or collapsed. S  - Dismantled and/or in storage. L -  Severe loss of historic integrity due to alteration.

Total Bridges Found: 9

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Agate Falls Bridge
HSRNational HSR. Local HSR.
Click to visit page.
M-28 Over Middle Branch Ontonagon River in Rural: Ontonagon County, Michigan, United States
Metal Two-Hinged Solid Ribbed Deck Arch, Fixed and Approach Spans: Concrete Slab, Fixed
Length: 193 ft. Main Span: 150 ft. Roadway: 32.2 ft. Main Spans: 1
Built 1930 By: Meads and Anderson and Michigan State Highway Department
This magnificent arch bridge is the older and more ornate of two distinctive steel deck arch bridges in the Upper Penninsula.
Agate Falls Railroad Bridge
HSRNational HSR. Local HSR.
Click to visit page.
Railroad (Bergland to Sidnaw Rail Trail / Trail 8) Over Middle Branch Ontonagon River in Rural: Ontonagon County, Michigan, United States
Metal Deck Girder, Fixed
Built 1900 By: American Bridge Company of New York, New York
This impressive high level bridge is one of the earliest bridges built by the prolific American Bridge Company.
Baltimore River Railroad Bridge
HSRNational HSR. Local HSR.
Click to visit page.
Railroad (Bergland to Sidnaw Rail Trail / Trail 8) Over Baltimore River in Rural: Ontonagon County, Michigan, United States
Metal Deck Girder, Fixed
Length: 435 ft. Roadway: 8 ft. Main Spans: 13
Built 1899 By: Lassig Bridge and Iron Works of Chicago, Illinois
This plate girder with steel bents for support carries a former railroad line over a shallow river valley.
M-26 West Branch Firesteel River Bridge
HSRNational HSR. Local HSR.
Click to visit page.
M-26 Over West Branch Firesteel River in Rural: Ontonagon County, Michigan, United States
Metal Cantilever Variable Depth Deck Girder, Fixed
Length: 270 ft. Main Span: 102 ft. Roadway: 28 ft. Main Spans: 3
Built 1952 By: Unknown and Michigan State Highway Department
One of several examples of a Michigan cantilevered haunched deck plate girder in this area.
M-38 Bridge
HSRNational HSR. Local HSR.
Click to visit page.
M-38 Over West Branch Firesteel River in Rural: Ontonagon County, Michigan, United States
Metal Cantilever Variable Depth Deck Girder, Fixed
Length: 240 ft. Main Span: 90 ft. Roadway: 31 ft. Main Spans: 3
Built 1958 By: Jackson Construction Company and Michigan State Highway Department
An example of a Michigan standard riveted haunched deck plate girder with cantilevers and a suspended span.
X
Old East Shore Road Bridge
HSRNational HSR. Local HSR.
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East Shore Road (Old Alignment) Over West Branch Ontonagon River in Rural: Ontonagon County, Michigan, United States
Metal 3 Panel Rivet-Connected Warren Pony Truss, Fixed
Main Spans: 1
Built By: Unknown
This is a small Warren pony truss, a bridge type that is uncommon in this region.
Old M-26 West Branch Firesteel River Bridge
HSRNational HSR. Local HSR.
Click to visit page.
Old M-26 Over West Branch Firesteel River in Rural: Ontonagon County, Michigan, United States
Concrete Closed Spandrel Deck Arch, Fixed
Length: 35 ft. Main Spans: 1
Built 1922 By: Unknown and Michigan State Highway Department
This is an unusual arch bridge that sits buried in the woods on a long-abandoned alignment of M-26.
Ontonagon Railroad Bridge
HSRNational HSR. Local HSR.
Click to visit page.
Railroad (Escanaba and Lake Superior Railroad) Over Ontonagon River in Ontonagon: Ontonagon County, Michigan, United States
Metal 6 Panel Pin-Connected Pratt Full-Slope Pony Truss, Fixed and Approach Spans: Metal Deck Girder, Fixed
Length: 470 ft. Main Span: 100 ft. Roadway: 15 ft. Main Spans: 2
Built 1899 By: Lassig Bridge and Iron Works of Chicago, Illinois
A rare and early surviving example of a multi-span railroad pony truss bridge.
US-45 East Branch Ontonagon River Bridge
HSRNational HSR. Local HSR.
Click to visit page.
US-45 Over East Branch Ontonagon River in Rural: Ontonagon County, Michigan, United States
Metal Continuous Variable Depth Deck Girder, Fixed
Length: 384 ft. Main Span: 144 ft. Roadway: 35 ft. Main Spans: 3
Built 1958 By: Jackson Construction Company and Michigan State Highway Department
An example of a haunched deck plate girder designed by the Michigan State Highway Department.

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