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Spring Road Bridge

Spring Road Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: December 13, 2012

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Key Facts

Facility Carried / Feature Intersected
Spring Road (TR-105, CR-1000 South) Over East Fork Mazon River
Rural: Grundy County, Illinois: United States
Structure Type
Concrete Through Girder, Fixed
Construction Date and Builder / Engineer
1910 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
54 Feet (16 Meters)
Structure Length
162 Feet (49 Meters)
Roadway Width
15 Feet (4.57 Meters)
3 Main Span(s)
NBI Number

Historic Significance Rating (HSR)

Bridge Documentation

This bridge no longer exists!

Bridge Status: Demolished and replaced.

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

This three span bridge is a rare surviving example of a multi-span concrete through girder. Generally not built with span lengths beyond 60 feet, and generally reserved for small single-span river crossings, this bridge's three 54 foot spans are unusual. Deterioration has exposed part of a few reinforcing rods in the girders. The reinforcing rods are an old style, composed of twisted square bar. They are thoughtfully arranged within the concrete to address the forces the bridge experiances.  For example, one of the exposed bars observed clearly runs at an angle (like a diagonal member in a truss bridge) through the concrete girder. The bridge has articulated floorbeams visible under the deck.

The bridge is closed to traffic and is slated for demolition and replacement despite its heritage value. The bridge's deck is the worst deteriorated part of the bridge, with a hole found in one part of the deck. The girders are in decent condition, with only isolated areas of spalling that has exposed reinforcing rods for the bridge.

The National Bridge Inventory gives a 1910 construction date for this bridge. This may be an incorrect date. 1910 has been assigned to other bridges in Grundy County where it was obvious that the date was wrong. 1910 would place the bridge as one of the oldest girder bridges in the state. The bridge has an appearance similar to other concrete girder bridges in Illinois, that usually date from 1916 onward.


Photo Galleries and Videos: Spring Road Bridge

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Maps and Links: Spring Road Bridge

This historic bridge has been demolished. This map is shown for reference purposes only.

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