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UP Boyer River Bridge #3

Warren Through Truss Bridge over Boyer River
Dunlap, Harrison County, Iowa

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Name UP Boyer River Bridge #3
Built By Chicago & North Western Railway
Contractor American Bridge Company of New York
Currently Owned By Union Pacific Railroad
Length 270 Feet Total, 175 Foot Main Span
Width 2 Tracks
Height Above Ground 15 Feet (Estimated)
Superstructure Type Warren Through Truss and I-Beam
Substructure Type Concrete
Date Built 1948
Traffic Count 75 Trains/Day (Estimated)
Current Status In Use
UP Bridge Number 306.89
C&NW Bridge Number 913
Significance Local Significance
Documentation Date October 2015

This massive truss bridge crosses the Boyer River, next to the Canadian National Bridge and US-30.

The bridge was built in 1948 to replace a lighter Quadrangular Through Truss Bridge, built just 46 years before. A longer span was required to mitigate flooding issues in the area.

The new span is a massive 8 panel, riveted Warren Through Truss with heavily constructed members. It rests on concrete pile piers.
In addition, it is approached by I-Beam spans. The remains of the old stone abutments can be seen below.

The photo above is an overview. The author has ranked the bridge as being locally significant, due to the newer age.

Boyer River Railroad Bridges
Upstream CN Boyer River Bridge #7
Downstream CN Boyer River Bridge #8

Citations

Source Type

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