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Mill City Railroad Bridge

Mill City Railroad Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: September 2, 2018

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Key Facts

Facility Carried / Feature Intersected
Railroad (Mill City Trail Rail-Trail) Over Santiam River
Location
Mill City: Linn County, Oregon and Marion County, Oregon: United States
Structure Type
Metal 6 Panel Pin-Connected Pratt Through Truss, Fixed and Approach Spans: Wood Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
1888 By Builder/Contractor: Phoenix Bridge Company of Phoenixville, Pennsylvania

Technical Facts

Rehabilitation Date
1919
Main Span Length
120 Feet (37 Meters)
Structure Length
285 Feet (87 Meters)
Roadway Width
15 Feet (4.57 Meters)
Spans
1 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)

Bridge Documentation

View Historic Bridge Inventory Sheet For This Bridge

This extremely rare and highly significant Phoenix column truss bridge has an interesting history. It was originally located over Gienega Creek south of San Jose, California, on the Southern Pacific Company Coast Line. In 1919, it was relocated here to Mill City. At the time it was relocated it appears some alterations were made. Because the alterations themselves are so old as to be themselves historic, this is an interesting bridge to "read" because one must look closely to see how the bridge was altered. Notably, the hip verticals (likely eyebars originally) were replaced with built-up beams. The sway bracing and portal bracing were altered. The original ornamental cast iron portal bracing knees that one might expect to find on a Phoenix truss bridge were replaced with a simpler design. Empty holes on the end posts and vertical members indicate that the bracing knees were replaced with something different. The horizontal struts of the sway bracing also appear to be spliced, suggesting perhaps the width of the bridge was changed when it was moved.

In the bridge's more recent history, the railroad line it served was abandoned and converted into a rail-trail. As of 2018, Mill City was raising funds to restore the bridge. As one of Oregon's oldest and rarest historic bridges, this is certainly a worthwhile endeavor.

This bridge is next to a historic highway bridge.


This bridge is tagged with the following special condition(s): Phoenix Columns

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Photo Galleries and Videos: Mill City Railroad Bridge

 
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Maps and Links: Mill City Railroad Bridge

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