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CN IA-4 Bridge

Through Plate Girder Bridge over Iowa Highways 4 and 7
Pomeroy, Calhoun County, Iowa

Click the Photo Above to See All Photos of This Bridge!
Name CN IA-4 Bridge
Built By Illinois Central Railroad
Contractor Unknown
Currently Owned By Canadian National Railway
Length 36 Feet Total
Width 1 Track
Height Above Ground 14 Feet 1 Inch
Superstructure Type Through Plate Girder
Substructure Type Concrete
Date Built 1937
Traffic Count 4 Trains/Day (Estimated)
Current Status In Use
CN Bridge Number 401.0
Significance Local Significance
Documentation Date April 2018
Between 1869 and 1870, the Iowa Falls and Sioux City Railroad built 184 miles of new railroad between Iowa Falls, Iowa and Sioux City, Iowa.
In 1888, the railroad became part of the Dubuque & Sioux City Railroad, despite having been related to the D&SC since inception.
The Dubuque & Sioux City mainline extended from Chicago, through Freeport and Dubuque, to Waterloo and Fort Dodge.
The D&SC had been related to the Illinois Central for some time, before officially becoming part of the IC in 1946.
This route became a main line for the IC, which merged with the Gulf, Mobile and Ohio Railroad to form Illinois Central Gulf in 1972.
In 1985, the IC spun off this route to the Chicago Central and Pacific Railroad, who operated this route until 1999, when it was purchased by Canadian Pacific Railway.
Today, CN operates the Fort Dodge-Sioux City portion of the line as the Cherokee Subdivision.
06/26/21


This small through girder bridge crosses Iowa Highways 4 and 7 in the town of Pomeroy.
Built in 1937, the bridge consists of a single through girder span, set onto concrete substructures. The deck of the bridge has been encased in concrete to preserve the structure.
It is unknown when the deck was rebuilt. It appears to be more recently, as other alterations such as the addition of bolts shows a modern rehabilitation.
Overall, the bridge appears to be in fair to good condition. Some deterioration can be found on the superstructure.

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

Citations

Source Type

Source

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



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