CN Sangamon River Bridge (Gibson City)


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Name CN Sangamon River Bridge (Gibson City)
Illinois Central Railroad Bridge #D-116.4
Built By Illinois Central Railroad
Currently Owned By Canadian National Railway
Superstructure Contractor Unknown
Length 168 Feet Total, 14 Foot Spans
Width 1 Track
Height Above Ground 15 Feet (Estimated)
Superstructure Design Concrete Slab
Substructure Design Concrete Pile
Date Built 1920
Traffic Count 10 Trains/Day (Estimated)
Current Status In Use
Illinois Central Railroad Bridge Number D-116.4
Canadian National Railway Bridge Number 116.4
Significance Local Significance
Documentation Date 11/6/2022

In 1871, the Gilman, Clinton & Springfield Railroad (GC&S) completed 102 miles of new railroad, extending from the Illinois Central Railroad (IC) mainline at Gilman, Illinois to Springfield, Illinois.  This route provided an underserved area in Central Illinois with a reliable railroad connection.  In 1873, the GC&S would become bankrupt, and in 1877 would be acquired by IC subsidiary Chicago & Springfield Railroad (C&S).  The C&S was formally consolidated into the IC in 1902, and IC significantly improved the track between Gilman and Springfield, constructing new bridges and realigning the railroad.  Further improvements would be made in 1923, when a segment near Springfield would be double tracked.  By the 20th Century, the IC was a respected railroad, operating an extensive railroad network through the central United States.  Throughout the later part of the 20th Century, traffic on this line began to fall, and the line became more of a connecting line for the railroad.  In 1972, the IC merged with the Gulf, Mobile & Ohio Railroad (GM&O) to form the Illinois Central Gulf (ICG).  In 1988, the ICG was reorganized as the Illinois Central Railroad (IC).  In 1998, IC was purchased by the Canadian National Railway (CN).  Today, CN continues to operate this line as the Gilman Subdivision.


Located along Illinois Route 54 a few miles southwest of Gibson City, this concrete slab bridge carries the former IC over the Sangamon River. Built in 1920 to replace a pile trestle, the bridge consists of twelve 14-foot concrete slab spans, set onto concrete pile substructures. This design of bridge was standard for several railroads, as it provided a cheap, durable and easy to construct alternative to wooden pile trestles. The concrete slabs could be cast offsite, and shipped by rail car for use at the bridge. The concrete piles consist of typical octagon shaped piles, with concrete caps and footers. It is unknown what portions of this bridge were constructed by the railroad, and which portions were constructed by contract. Overall, the bridge appears to be in fair condition, with some spalling noted throughout the structure. The author has ranked the bridge as being locally significant, due to the common design.


Citations

Build date Illinois Central Gulf Illinois Division 1978 Track Profile
Railroad History Citation ICC Valuation Information, Compiled by Richard S. Steele

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