CN Mondamin Street Bridge (Minooka)

Deck Plate Girder Bridge over Mondamin Street (County Road 3)
Minooka, Grundy County, Illinois

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Name CN Mondamin Street Bridge (Minooka)
Built By Elgin, Joliet & Eastern Railway
Contractor American Bridge Company of New York
Currently Owned By Canadian National Railway
Length 55 Feet Total
Width 1 Track
Height Above Ground 15 Feet (Estimated)
Superstructure Type Deck Plate Girder
Substructure Type Stone Masonry
Date Built 1903
Traffic Count 4 Trains/Day (Estimated)
Current Status In Use
Significance Local Significance
Documentation Date July 2018
In 1888, the Gardner & Coal City Railway built a line between Walker, Illinois and Gardner, Illinois. Walker was located just south of Plainfield, near the Elgin, Joliet & Eastern Railway DuPage River bridge.
The G&CC was eventually absorbed by the Elgin, Joliet & Eastern Railway in 1891. The route ran through towns such as Minooka, before crossing the Illinois River near Aux Sable.
This short route has a heavy industrial background. It was originally constructed to haul coal from the rich coalfields of Grundy County, however it later manifested significant industrial areas near the Illinois River and Minooka.
It is unknown when the branch south of the Illinois River was abandoned. The EJ&E was purchased by Canadian National in 2009, which currently owns the line across the Illinois River.

Located in the town of Minooka, this bridge crosses West Mondamin Street near Ridge Road.
Built in 1903, the bridge features a single deck plate girder span, set onto stone substructures. This bridge is an oddity for its survival, as it was originally built to cross a small dirt road, but now crosses a major arterial road.
Girder spans like this were commonly used to cross creeks and roads, due to the durability and simplicity to build.
Since construction, the bridge appears to remain significantly unchanged, with no major alterations to the bridge noted.
Overall, the bridge appears to be in good condition, with minor deterioration noted throughout the structure.

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 American Bridge Company plaque
Contractor American Bridge Company plaque
Railroad Line History Source ICC Valuation Information, Compiled by Richard S. Steele

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