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Maier Avenue Bridge

F. W. Kent Park High Truss Bridge

Maier Avenue Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: August 10, 2013

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Key Facts

Facility Carried / Feature Intersected
Rod Dunlap Memorial Bridge Trail Over F. W. Kent Park Lake
Location
Rural: Johnson County, Iowa: United States
Construction Date and Builder / Engineer
1902 By Builder/Contractor: Pratt Bridge Company of Coffeyville, Kansas

Technical Facts

Rehabilitation Date
Not Available or Not Applicable
Main Span Length
70 Feet (21.34 Meters)
Structure Length
Not Available
Roadway Width
Not Available
Spans
1 Main Span(s)
NBI Number
Not Applicable

Historic Significance Rating (HSR)

Bridge Documentation

Introduction

This webpage and narrative you are currently viewing is for one of the seven historic bridges that have been relocated to F. W. Kent Park on the Rod Dunlap Memorial Bridge Trail. This page provides a discussion of the individual bridge. Please also view the Dane Road Bridge page which includes a general overview discussion of F. W. Kent Park on the Rod Dunlap Memorial Bridge Trail. The map on this page shows F. W. Kent Park with all seven bridges labeled. You can click on the name of a bridge to switch to a particular bridge's page. Visit the official page for the park here. If you want to view an enlarged version of the bridge map to the left, click here.

About The Bridge

This bridge was first erected in 1902 over Old Man's Creek near Iowa City on Maier Avenue. The bridge was reportedly relocated to the park in 2003, however the abutments the bridge sits on have 1996 carved into them, suggesting either this date is incorrect or that the abutments were built many years before the bridge was moved here.

The truss bridge was reported to be built by the Pratt Bridge Company. The unusual name which does not appear to be associated with the inventors of the Pratt truss (Thomas and Caleb Pratt). The company does not appear to have been very large or prolific. The only information found during online research was that The Pratt Bridge Company was based out of Coffeyville, Kansas and established a branch of its works at Denver, Colorado in 1887.

This is the only through truss in the park. The bridge is described on park signage as a high truss bridge. This term is a less common term that means the same thing as "through truss." Similarly, pony truss bridges were sometimes called "low" truss bridges. The bridge is a good representative example of a pin-connected through truss. It is traditionally composed and features an a-frame portal bracing.

When it was relocated to the park, the bridge was made more narrow. When pony truss bridges are made more narrow, depending on the extent, it may not have a major visual effect. However, with a through truss making the bridge more narrow requires a complete reconfiguration and alteration of all overhead bracing on the bridge. Because this bracing's arrangement has been changed, it can substantially change the appearance of the bridge. As such, this bridge will have an unusual appearance to anyone familiar with viewing pin-connected highway truss bridges. In general, HistoricBridges.org recommends avoiding making through truss bridges more narrow for these reasons if it is reasonable to avoid doing so. Apparently one of the reasons for making this particular bridge more narrow was to make it lighter, and allow for its unusual form of transportation to the park. The narrowed truss was brought to the park in a pre-assembled condition by way of Chinook Helicopter which flew the bridge into the park and onto its abutments. The helicopter service was provided by the Iowa National Guard's Company F 106 Aviation Unit.

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Photo Galleries and Videos: Maier Avenue Bridge

 
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