CN Bridge #422.8

Concrete Arch Culvert over Field Drainage Stream
Carnarvon, Sac County, Iowa

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Name CN Bridge #422.8
Built By Illinois Central Railroad
Contractor Unknown
Currently Owned By Canadian National Railway
Length 7 Feet 6 Inches Total
Width 1 Track
Height Above Ground 5 Feet (Estimated)
Superstructure Type Concrete Arch Culvert
Substructure Type Concrete
Date Built 1899
Traffic Count 2 Trains/Day (Estimated)
Current Status In Use
CN Bridge Number 422.8
Significance Local Significance
Documentation Date December 2018
In 1898, the Fort Dodge and Omaha Railroad began construction of a new line, linking a Dubuque & Sioux City Railroad (Illinois Central) line at Tara, Iowa to Omaha, Nebraska.

This new line would be completed in a staggering 208 days, opening in early 1899. The line was owned by the D&SC (which was a subsidiary of Illinois Central).
The line was also the most significant branch off the D&SC mainline through Iowa.

The new line connected mainly rural areas, and crossed into Omaha on a swing bridge over the Missouri River.
This bridge was leased from the Omaha Bridge and Terminal Railway Company.

When completed, the line was regarded as a mainline, connecting Nebraska to Chicago. East of Tara, the line connected Waterloo, Dubuque and Chicago.

By 1947, the IC fully absorbed any remains of the Dubuque & Sioux City Railroad. IC became the sole operator and proprietor of this line.
In 1972, the Gulf, Mobile & Ohio merged with IC to form the Illinois Central Gulf.

In 1985, operations of the ICG western division (west from Chicago) was spun off into the Chicago Central and Pacific Railroad.
By 1996, the railroad was repurchased by Illinois Central. Canadian National Railway purchased Illinois Central in 1999, and continues to operate the line as the Omaha Subdivision.

Located near the small town of Carnarvon, this small concrete arch culvert crosses a field drainage near Quincy Avenue.
Built in 1899, the bridge features a single concrete arch culvert span, set onto concrete substructures. This type of arch culvert was standard for this route.
Overall, it appears that the bridge is in good condition. Only deterioration of the headwall was found on the bridge.

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


Source Type


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

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