Hudson Swing Bridge

Through Truss Swing Bridge over St. Croix River
Hudson, St. Croix County, Wisconsin
Lakeland, Washington County, Minnesota

Click the Photo Above to See All Photos of This Bridge!
Name Hudson Swing Bridge
Built By Chicago, St. Paul, Minneapolis & Omaha Railway
Contractor (Through Trusses) American Bridge Company of New York
Contractor (Pony Truss) Pencoyd Iron Works of Pencoyd, Pennsylvania
Currently Owned By Union Pacific Railroad
Length 568 Feet Total, 319 Foot Swing Span
Width 1 Track
Height Above Ground 15 Feet (Estimated)
Superstructure Type Pratt Through Truss and Parker Pony Truss
Substructure Type Stone Masonry and Concrete
Date Built 1898 and 1912
Traffic Count 15 Trains/Day (Estimated)
Current Status In Use
UP Bridge Number 18.61
Significance Moderate Significance
A brief history of the Chicago, St. Paul, Minneapolis & Omaha Railway Elroy-St. Paul mainline:


This iconic structure crosses the St. Croix River at Hudson, just upstream from the I-94 bridge.
The bridge is a rather noticeable structure, employing an odd mixture of spans. The main span is a swing span, containing a pair of 6 panel, riveted Pratt Through Trusses.
In addition, another 6 Panel Pratt Through Truss with riveted connections and a 6 panel Parker Pony Truss with riveted connections make up the east end of the bridge. When constructed, there were nine more pony trusses along the east side of the bridge, which were filled in prior to 1938. The pony truss was originally built in 1898, while the remaining bridge was built in 1912-13.
The bridge rests on a combination of stone and concrete substructures.
The current bridge replaced two predecessors. The first structure at this location was a wooden swing span, with a long trestle approach on the east side. This approach was nearly 1,000 Feet Long.
In 1881, this span was replaced with a Lattice Truss style swing span, along with a Lattice through truss and numerous pony truss spans.
This bridge was replaced in 1912 by the current bridge. Much of the long approach has been converted to a long fill in the river.
Presently, best views of this bridge would come by boat. However, walking along the banks of the river or photographing it from the Hudson River Walk works as well.

The author has ranked this bridge as being moderately significant, due to the truss design.
The photo above is from Quant Avenue, on the Minnesota Side of the river.

St. Croix River Railroad Bridges
Upstream Wisconsin Central High Bridge
Downstream Old Prescott Swing Bridge


Source Type


Bridge History Chicago, St. Paul, Minneapolis & Omaha Railway Bridge Notes at the National Archives; College Park, Maryland
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele

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