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Iroquois 2800 Bridge

TR-49B Bridge

Iroquois 2800 Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 13, 2006

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Key Facts

Facility Carried / Feature Intersected
Iroquois 2800 Over Prairie Creek
Location
Rural: Iroquois County, Illinois: United States
Construction Date and Builder / Engineer
1904 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
50 Feet (15 Meters)
Structure Length
51 Feet (15 Meters)
Roadway Width
15.7 Feet (4.79 Meters)
Spans
1 Main Span(s)
NBI Number
38323009029

Historic Significance Rating (HSR)

Bridge Documentation

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

Please visit the Iroquois 1250 bridge page for an in-depth overview of bedstead truss bridges. This 2800 bridge is different in terms of appearance than the Iroquois 1250, including the presence of v-lacing on the verticals of this 2800 bridge, which suggests that the 2800 Bridge was not built by the Smith Bridge Company like Iroquois 1250. Strictly speaking, the Iroquois 2800 Bridge as seen today is not a bedstead truss bridge. It is a pony truss with vertical end posts. A bedstead truss must have vertical end posts that extend below the bridge superstructure to additionally function as a substructure. This bridge does not do that. However, their are substantial welded plate additions to the ends of this bridge. Vertical endpost pony truss bridges that are not bedstead truss bridges are exceedingly rare, even more than bedstead trusses which are themselves rare. This fact, combined with the alterations found at the ends of the bridge suggest this is actually a bedstead truss bridge that had its legs cut off and was placed on a full abutment substructure system. The abutment is the final piece of evidence that such an alteration may have taken place, since it is not original. The abutment seen today is built from corrugated steel, with an i-beam on top to support the truss bridge. There is no proof that this bridge was originally a bedstead, but it is highly likely based on the aforementioned facts. Despite the alteration, the bridge is still significant since the rest of the truss is largely unaltered, and it is increasingly rare in a county that has demolished so many of its historic truss bridges.

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Photo Galleries and Videos: Iroquois 2800 Bridge

 
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Maps and Links: Iroquois 2800 Bridge

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