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A former highway bridge that only carries a pipeline today, this is a very unusual design of cantilever truss bridge. The bridge does not try to visually hide the fact that it is a cantilever design. The deck truss cantilever arms are clearly identifiable as such as they extend out from the piers with an ever-decreasing depth, and they hold a pony truss span in the center, with that transition from deck truss to pony truss being abrupt. With most traditional cantilever truss bridges, the center span would be called a suspended span as it would be hung from the cantilever arms with hangers. With this bridge however, it instead bears on top of the cantilever arms, and again visually this design is not hidden at all; the pony truss looks exactly like a simple span pony truss one might find spanning a small creek.
The Coast Bridge Company of Portland, Oregon erected the substructure and superstructure of the bridge, using steel fabricated by Northwest Steel Company of Portland, Oregon.
This is one of the most unusual cantilever truss bridges in the country, and also noted as a very old bridge in Oregon, particularly among Willamette River bridges, and the bridge is highly significant as a result. Despite the conversion to a pipeline bridge, the actual truss structure appears to retain good historic integrity.
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