This bridge is the oldest highway swing bridge in Oregon and the only pin-connected movable highway bridge in Oregon. The swing span is in fact composed of a combination of riveted and pinned connections. West of the swing span is an all-pinned Parker truss span. East of the swing span is an all-riveted polygonal Warren pony truss span (an early example of polygonal Warren design) that is unusual for its short length and only a total of four different slopes on the endpost/top chord system (less than even the five slopes of a Camelback truss). There once was a similar pony truss span at the western end of this bridge, but that has been mostly replaced with a stringer beam system, although some of the floorbeams and connections of the pony truss were left behind, resulting in a rather unusual appearance in the westernmost spans of this bridge, which are visible in detail from the walkway that passes under these approach spans.
Note that the sway bracing on the through truss spans was altered at some point to increase vertical clearance. Although this bridge does not operate for boats anymore, the swing span retains the integrity of its design to allow it to retain high significance, especially considering the rarity of this type of bridge in Oregon.
This bridge only carries eastbound traffic today, with a nearby newer bridge carrying westbound traffic.
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