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Iroquois 500 Bridge

TR-345A Bridge

Iroquois 500 Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: May 8, 2010

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Key Facts

Facility Carried / Feature Intersected
Iroquois 500 (TR-345A) Over Spring Creek Tributary
Location
Rural: Iroquois County, Illinois: United States
Structure Type
Concrete Through Girder, Fixed
Construction Date and Builder / Engineer
1916 By Builder/Contractor: Joseph Klein of Freeburg, Illinois

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
51 Feet (15.5 Meters)
Structure Length
53 Feet (16 Meters)
Roadway Width
18 Feet (5.49 Meters)
Spans
3 Main Span(s)
NBI Number
38432909224

Historic Significance Rating (HSR)
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Bridge Documentation

View Archived National Bridge Inventory Report - Has Additional Details and Evaluation

This bridge is an excellent example of a standard plan concrete through girder in Illinois. The bridge is unaltered and retains near-perfect historic integrity, and also remains in good structural condition despite never having been repaired or rehabilitated. The only major blemish on the bridge is spalling at the end of a girder. The bridge is a relatively long span for a concrete through girder, although in Illinois and Iroquois County there are larger span examples. This bridge is also significant for its very early 1916 construction date. It was around this time when concrete girders began to be built with frequency. As such, this bridge should be considered historically and technologically significant. Concrete through girders are a nationally rare structure type today. Their popularity only lasted for about 20 years, mainly between 1915 and 1935, mainly because they were inefficient for deck widths much wider than 22 feet. Michigan and Illinois both appear to have the largest numbers of surviving concrete through girders in the country. This does not mean either state has a large actual number however. As such, surviving examples that have integrity should be considered to have historic value. The bridges tend to be heavily built and very durable. Those examples that are located on quiet rural roads such as this one make good candidates for preservation.

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Photo Galleries and Videos: Iroquois 500 Bridge

 
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Maps and Links: Iroquois 500 Bridge

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