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CN Boyer River Bridge #7

Through Girder Bridge over Boyer River
Near Dunlap, Harrison County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name CN Boyer River Bridge #7
Built By Illinois Central Railroad
Contractor American Bridge Works of Chicago
Currently Owned By Canadian National Railway
Length 227 Feet Total, 91 Foot Main Span
Width 1 Track
Height Above Ground 15 Feet (Estimated)
Superstructure Type Through Plate Girder
Substructure Type Concrete and Timber Pile
Date Built 1899
Traffic Count 2 Trains/Day (Estimated)
Current Status In Use
CN Bridge Number 469.3
Significance Local Significance
Documentation Date October 2015


Located near Dunlap, this through girder bridge crosses the Boyer River.
Built in 1899, the bridge features a trio of through girder spans. However, the bridge has had its substructures updated since the original construction. Currently, it sits on both concrete and timber substructures.
Unlike other bridges along this route, it is unknown if these spans were relocated here. However, the author believes it may be likely.
This route once crossed the Boyer River almost two dozens times, although most of these crossings have since been filled in. This through girder design was standard for the Boyer River crossings.
Overall, the bridge appears to be in good condition.

The author has ranked this bridge as being locally significant, due to the common design.
The photo above is an overview.

Boyer River Railroad Bridges
Upstream CN Boyer River Bridge #7
Downstream UP Boyer River Bridge #3

Citations

Source Type

Source

Erection Date 1973 Illinois Central Railroad Track Profile
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele