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CN Bridge #430.0

Through Plate Girder Bridge over Unnamed Creek (Old Boyer River)
Carnarvon, Sac County, Iowa

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Name CN Bridge #430.0
Built By Illinois Central Railroad
Contractor American Bridge Works of Chicago
Currently Owned By Canadian National Railway
Length 91 Feet Tota
Width 1 Track
Height Above Ground 10 Feet (Estimated)
Superstructure Type Through Plate Girder
Substructure Type Concrete
Date Built 1900
Traffic Count 2 Trains/Day (Estimated)
Current Status In Use
CN Bridge Number 430.0
Significance Local Significance
Documentation Date December 2018


Located west of Carnarvon and east of Kiron, this large through girder bridge crosses an unnamed creek.
Built in 1900, the bridge features a single through girder span, set onto concrete abutments. The bridge was originally constructed to cross the Boyer River, but a channelization in the late 1950s eliminated several crossings along this route.
This span is also a standard size for this route, installed when the route was constructed. Overall, the bridge appears to be in good condition, with little serious deterioration.

The author has ranked this 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 Track Profile
Builder Illinois Central Bridge Notes at the National Archives; College Park, Maryland
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele