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Webster Street Bridge

Zola Avenue Bridge

   


Webster Street Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 10, 2013
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Key Facts

Facility Carried / Feature Intersected
Webster Street (Zola Avenue) Over Railroad (Union Pacific)
Location
Le Grand: Marshall County, Iowa
Structure Type
Metal 7 Panel Rivet-Connected Double-Intersection Warren Pony Truss, Fixed and Approach Spans: Wood Stringer (Multi-Beam), Fixed
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
79 Feet (24 Meters)
Structure Length
130 Feet (39.6 Meters)
Roadway Width
20.3 Feet (6.2 Meters)
Spans
1 Main Span(s) and 6 Approach Span(s)
NBI Number
242420

Historic Significance Rating (HSR)

Bridge Documentation

This is a design of bridge that is in general highly unusual, but can be found on multiple highway over railroad type bridges. They are likely the design of the railroad company... although highway bridges, some of the design is more typical of a railroad bridge. The unusual design lies in the composition of the truss members, which are a combination of angles and plate. This gives the bridge's truss members visually a somewhat more two-dimensional appearance compared to most truss bridges. A series of timber approach spans are also present at each end of this bridge. There is a dramatic "hump" to this bridge.

This bridge is noteworthy as an unusual example of a bridge with riveted connections yet has floor beams hung by u-bolts. U-bolts were more common with pin-connected truss bridge. However, this bridge's u-bolts do not use a pin and instead are riveted to the vertical member.

This bridge shows signs of alteration. An outrigger is missing at one end of the bridge. Also, something has been removed from the trusses at a number of additional points. Empty rivet holes are testimony to this. It is not sure what was removed, it might have been an outrigger, or it might have been a full-blown vertical member. Either way its a mystery since it is unclear why these elements which provide a benefit to the truss structure would be removed.

A ca. 1940 date was found on www.bridgehunter.com for this bridge. This bridge appears to be older than that. Perhaps the 1940 date refers to a relocation date. This may be when the alterations occurred as well... or perhaps the date refers only to the alteration of this bridge, and the bridge was never relocated. Or the date could be a complete error. It is a mystery!

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Photos and Videos: Webster Street Bridge

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