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Bay City Railroad Bridge

   


Bay City Railroad Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: June 16, 2003
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Key Facts

Facility Carried / Feature Intersected
Railroad (Central Michigan Railroad) Over Saginaw River
Location
Bay City: Bay County, Michigan
Structure Type
Metal Rivet-Connected Pratt Through Truss, Movable: Swing (Center Pier) and Approach Spans: Metal 7 Panel Rivet-Connected Pratt Through Truss, Fixed
Construction Date and Builder / Engineer
1905 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
1925
Main Span Length
245 Feet (74.7 Meters)
Structure Length
660 Feet (201.2 Meters)
Roadway Width
Not Available
Spans
1 Main Span(s) and 3 Approach Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)

Bridge Documentation

This bridge is similar, but not the same, as the Saginaw Railroad Swing Bridge, which also originally served Michigan Central Railroad. It is possible then that Michigan Central may have contracted the Wisconsin Bridge and Iron Company, builder of the Saginaw bridge, to build this Bay City bridge as well. Alternatively, both bridges may have been designed by Michigan Central using the same standard plan which would also account for the similarity in appearance. Like the Saginaw bridge, the Bay City Bridge has fixed through truss approach spans. This is due to the fact that Saginaw River is quite wide, and only a small portion of the bridge needed to open for boats. The Bay City spans differ from the Saginaw spans because they have v-lacing on the top chord. On the Bay City bridge, these stationary spans are two in number, and are located at the west end of the bridge. One large through plate girder span provides an eastern approach. The configuration of the swing span is a Pratt design.

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