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All viaducts are bridges but not each bridge is a viaduct. A succession a number of bridges with short spans in relation to the total length the structure is called a trestle. If the spans are long, around 150 - 200+ ft, we have a viaduct. The approaches of the Detroit Superior Bridge fit the viaduct definition, but as each approach span is an open-spandrel arch bridge, I would tend to arch bridge. But that is disputable. Regards, Volker
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