This bridge was originally constructed over the John Day River in north central Oregon for the Oregon Railway and Navigation Company, and relocated and reused by the Southern Pacific Railroad Company here in 1907.
This bridge's lattice portal and sway bracing, Whipple truss configuration, horizontal member that passes through the middle of the end panels, and the bridge's cast iron portal ornamentation and plaques all are distinctive details of famous engineer George Morison. George Morison designed some of the first bridges over major rivers like the Mississippi and Missouri Rivers. Many of these bridges broke records for span length and were among the first large-scale metal bridges in the United States. However, nearly all of these bridges have been demolished and replaced today. Thus this bridge, which was a relatively small project for Morison, is one of the few surviving examples of this very important engineer's work. Despite the smaller size, the bridge contains the general design and appearance that Morison used for his longer spans. The bridge retains excellent historic integrity today and stands out as one of Oregon's most important historic bridges.
Above: Historical photo showing bridge in its original location over the John Day River for the Oregon Railway and Navigation Company.
Former bridge in Bismarck, North Dakota, displaying similar details to the Armitage Bridge.
Former bridge in Nebraska City, Nebraska, displaying similar details to the Armitage Bridge.
Above: Historical drawing for the Nebraska City, Nebraska, displaying similar details to the Armitage Bridge.
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