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US-45 Middle Branch Ontonagon River Bridge

US-45 Middle Branch Ontonagon River Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: October 1, 2012

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Key Facts

Facility Carried / Feature Intersected
US-45 Over Middle Branch Ontonagon River
Watersmeet: Gogebic County, Michigan: United States
Structure Type
Concrete T-Beam, Fixed
Construction Date and Builder / Engineer
1953 By Builder/Contractor: Unknown and Engineer/Design: Michigan State Highway Department

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
40 Feet (12.19 Meters)
Structure Length
40 Feet (12.19 Meters)
Roadway Width
38 Feet (11.58 Meters)
1 Main Span(s)
NBI Number

Historic Significance Rating (HSR)

Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This bridge is an example of a mid-20th Century concrete t-beam bridge in Michigan. It follows the typical state standards for bridges built during this period. The bridge is on a curve and has superelevation. The bridge has modern Armco guardrail added in front of the original type R4 railing. This would not be a major issue except that one of the posts for the guardrail is bolted right on top of the plaque for the bridge. The plaque literally got a hole drilled through it to bolt the railing on. Whether this is a historic bridge or not, this is an insensitive destruction of this bridge. MDOT has been caught doing this on more than one bridge and it is deeply disappointing. How hard would it be to at least drill the bolt hole somewhere beside the plaque rather than straight through it? Even better, put the post somewhere nearby so that the plaque can also continue to be read. It is impossible to tell who the contractor was for this bridge because the post covers up that information. Another option would have been to remove and remount the plaque in a different location on this bridge.

 The predecessor to this bridge, on former US-45 alignment is the nearby Crozer Street Bridge.


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