Photos
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West Approach Photo taken by J.R. Manning in August 2008 |
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Allenton Iron Bridge Historical Marker Photo taken by J.R. Manning in August 2008 |
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Oblique View Looking Northeast Photo taken by J.R. Manning in August 2008 |
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Southwest Vertical The mark of a bedstead pony truss is the steel plate abutment, not really a good idea against the wet and shifting soil of a riverbank. The vertical end post does not rest on a footing above the water line and extends down into the water, reinforced by a steel plate.
This led the Wisconsin Highway Commission to stop using bedstead trusses. One commissioner reportedly said, "Bedstead trusses are designed to sell, not to serve." Photo taken by J.R. Manning in August 2008 |
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The southeast endpost The buckled endposts demonstrate the structural weakness of this design. Photo taken by J.R. Manning in August 2008 |
