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370th Street Bridge

Iowa Bridge Number 349850

370th Street Bridge

Primary Photographer(s): Nathan Holth and Rick McOmber

Bridge Documented: June 30, 2009

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Key Facts

Facility Carried / Feature Intersected
370th Street Over Upper Iowa River
Location
Rural: Winneshiek County, Iowa: United States
Construction Date and Builder / Engineer
1904 By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
73.2 Feet (22.31 Meters)
Structure Length
147 Feet (44.81 Meters)
Roadway Width
16.1 Feet (4.91 Meters)
Spans
2 Main Span(s)
NBI Number
349850

Historic Significance Rating (HSR)

Bridge Documentation

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

In technical description, this is a two-span truss bridge with a Warren through truss span (painted orange) and a rusted Warren pony truss span. However in reality, this bizarre bridge has a different history. The orange through truss span is actually a pony truss bridge which was relocated from an unknown location and placed at this location. The truss was reconfigured with a completely new flooring system so that the deck was much lower within the truss web, with the deck surface actually at the same level as the bottom chord. With the deck lower, beams were added onto the top to act as sway bracing, turning a pony truss into  a through truss. It is unknown if  the other span, also a Warren pony truss but of a different design and configuration, is in its original location or if it was also relocated.

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Photo Galleries and Videos: 370th Street Bridge

 
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