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CN Thornapple River Bridge

Pratt Through Truss Bridge over Thornapple River
South of Murry, Rusk County, Wisconsin

Click the Photo Above to See All Photos of This Bridge!
Name CN Thornapple River Bridge
Built By Lake Superior & Southeastern Railroad
Contractor Wisconsin Bridge & Iron Company of Milwaukee
Currently Owned By Canadian National Railway
Length 240 Feet Total, 125 Foot Main Span
Width 1 Track
Height Above Ground 20 Feet (Estimated)
Superstructure Type Pratt Through Truss and Concrete Arch
Substructure Type Concrete
Date Built 1907, Rehabilitated 2006
Traffic Count 10 Trains/Day (Estimated)
Current Status In Use
CN Bridge Number 357.50
Significance Moderate Significance
A brief history of the Canadian National Superior Subdivision:


06/26/21


This small through truss bridge crosses the Thornapple River, south of the small town of Murry, in rural Rusk County.
The bridge contains a single, 4 panel, riveted Pratt Through Truss. This truss have been moderately reconstructed, although it still bears many of the original components.
In addition to the trusses being heavily rebuilt in 2006, the bridge is approached by concrete arches. On the south end, only a single arch stands; while the north end contains a trio of the arch spans.
On the north end, the arch spans are each 23' in length, while the south end has a 37' span.
The entire bridge rests on concrete substructures.

The author has ranked the bridge as being moderately significant, due to the age of the structure, but the heavy alterations detract from it.
The photo above is an overview.

Citations

Source Type

Source

Build Date Wisconsin Bridge & Iron Company plaque
Contractor Wisconsin Bridge & Iron Company plaque
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele



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