This bridge is one of two spans in Clackamas County which both came from the former Burnside Bridge in Portland, which dated to 1894 and was replaced in 1926, at which time these spans were moved here. This fact gives the two bridges in Clackamas County high significance in several categories. 19th Century pin-connected truss bridges in large urban cities were mostly replaced in the first half of the 20th century. Thus, very little examples of urban 19th century pin-connected truss bridges survive today. Because these spans were moved to rural areas, they managed to survive to the present day, making them very rare. These bridges are also noteworthy as some of the oldest metal truss bridges in Oregon, and their pin-connected truss design is particularly rare in the context of Oregon's primarily 20th century collection of historic bridges. Lastly, these truss spans, which were designed with wide decks and heavy truss members (for the period) show a complex and unusual design not normally found in pin-connected highway truss bridges. Parts of the bridge which would normally be expected to be simple components, such as the portal bracing and sway bracing, are very complex structures with their own members and pin connections on this bridge.
This bridge is the larger of the two spans.
This bridge is on a slight grade (slope).
Above: Historical photo showing the old Burnside Bridge in Portland, a swing bridge, from whose fixed approach truss spans were salvaged and relocated to Clackamas County.
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