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This is a unique bridge because it looks like a concrete arch bridge, such as a rainbow arch bridge or a Marsh arch bridge. However, it is classified as a steel arch bridge because the concrete that surrounds the solid steel boxes and beams within is simple gunnite (shotcrete) and thus the concrete is not a structural element, but acts more like a coat of paint to protect the steel. Gunnite was used because it was felt it would provide the bridge better protection from the corrosive sulphur dioxide fumes from the paper mills south of the bridge that existed when the bridge was built.
In 2012-2013 a major rehabilitation of this bridge took place. On many parts of the bridge the gunnite was blasted off and replaced in-kind.
Above: Historical Popular Science article showing the construction of the bridge.
Above: Postcard showing the previous suspension bridge at this location.
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