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Pherdon Road Private Bridge

Pherdon Road Private Bridge

Primary Photographer(s): Nathan Holth

Bridge Documented: May 14, 2011

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Key Facts

Facility Carried / Feature Intersected
Private Access Over South Branch Macon Creek
Location
Rural: Monroe County, Michigan: United States
Construction Date and Builder / Engineer
By Builder/Contractor: Unknown

Technical Facts

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

Historic Significance Rating (HSR)
View Information About HSR Ratings

Bridge Documentation

This bridge no longer exists!

At first glance this bridge appears to be a typical and small example of a bridge design that is common among early 20th Century truss bridges, a riveted Warren pony truss. However a closer look reveals that the bridge is something  far more. The design of this bridge is extremely unusual and at the time HistoricBridges.org documented it, no similar bridge existed among the over 2000 bridges documented on the website. The bridge could be described as a bedstead with inclined endposts. The bridge truss design overall is a Warren pony truss with inclined endposts, but instead of this truss sitting on bearings and an abutment, it is riveted rigidly to a vertical built-up beam that functions like a bedstead leg, and extends down below the truss a significant distance to rest on a concrete abutment base. This design is highly unusual, and should be considered historically and technologically significant due to its rarity and creative design. Another uncommon feature is the built-up floorbeams. By the time riveted connections  and Warren pony truss bridges were being built for highway use in Michigan, rolled floorbeams were more common. Another interesting feature of the bridge is the retaining wall behind the bridge and abutments. The retaining wall might at first glance appear to be an abutment, but as mentioned, the actual abutment is a very low concrete ledge on which the legs rest. The retaining wall simply holds dirt behind it to allow the roadway to reach the bridge deck. The retaining wall consists of vertical rolled beams which are riveted to metal plate panels, which hold the dirt behind. Some of these panels are deteriorating and bending, allowing gaps to form. On the north side of the bridge, these gaps have allowed trees to grow out. These trees have been around long enough that they are of significant size and they have grown around several parts of the truss on the north end.


This bridge is tagged with the following special condition(s): Available

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Photo Galleries and Videos: Pherdon Road Private Bridge

 
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Bridge Photo-Documentation
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Bridge Photo-Documentation
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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

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Maps and Links: Pherdon Road Private Bridge

This historic bridge has been demolished. This map is shown for reference purposes only.

This bridge is privately owned and on private land.

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