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B Avenue Bridge

B Avenue Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 10, 2013

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Key Facts

Facility Carried / Feature Intersected
B Avenue Over Railroad (Union Pacific)
Location
Rural: Tama County, Iowa: United States
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 (24.08 Meters)
Structure Length
136 Feet (41.45 Meters)
Roadway Width
18 Feet (5.49 Meters)
Spans
1 Main Span(s) and 4 Approach Span(s)
NBI Number
318380

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 shows signs of alteration. Something has been removed from the trusses at a number of points. Empty rivet holes at points on the top and bottom chord 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.

The bridge is skewed. End posts at two corners of the bridge have an odd vertical member 3/4 of the way up the end post. As this only occurs at two of the four corners of the bridge this appears to be something that is a result of the skewed bridge design.

A ca. 1920 date was found on www.bridgehunter.com for this bridge. This bridge appears to be older than that. Perhaps the 1920 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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Photo Galleries and Videos: B Avenue Bridge

 
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Bridge Photo-Documentation
Original / Full Size Photos
A collection of overview and detail photos. This gallery offers photos in the highest available resolution and file size in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
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Bridge Photo-Documentation
Mobile Optimized Photos
A collection of overview and detail photos. This gallery features data-friendly, fast-loading photos in a touch-friendly popup viewer. Alternatively, Browse Without Using Viewer
View Video
CarCam: Northbound Crossing
Full Motion Video
Note: The downloadable high quality version of this video (available on the video page) is well worth the download since it offers excellent 1080 HD detail and is vastly more impressive than the compressed streaming video. Streaming video of the bridge. Also includes a higher quality downloadable video for greater clarity or offline viewing.

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