Northern Pacific viaduct at Weston, Washington, circa 1914. Steel viaduct under construction in snow. Photo by Alma Floberg, J.M. Fredrickson collection. Other Subject Classes: bridge

Northern Pacific viaduct at Weston, Washington, circa 1914. Viaduct nearing completion, construction cranes, workers, approaching passenger train. Photo by Alma Floberg, J.M. Fredrickson collection.. Other Subject Classes: bridge, crane, construction worker, passenger train

Northern Pacific viaduct at Weston, Washington, circa 1914. Steel viaduct under construction in snow. Photo by Alma Floberg, J.M. Fredrickson collection. Other Subject Classes: bridge

A view from the Washington side of Oregon Trunk Celilo Bridge T-0-4, 1912. Photo by the Kiser Photo Company.

A view from the south end of Oregon Trunk Celilo Bridge T-0-4 while still under construction, circa. 1911.

A view of the opening of Oregon Trunk Celilo Bridge T-0-4 on January 5, 1912. From the Oregon Historical Society Collection.

Color postcard view of Oregon Trunk Celilo Bridge T-0-4 with a southbound steam powered freight train, undated.

A view of Oregon Trunk Celilo Bridge T-0-4 from the rear of Oregon Trunk passenger Train Number 103 as the train heads to Wishram, Washington, July 11, 1954. Photo by Miln Gillespie.

Detail view of Oregon Trunk Celilo Bridge T-0-4, October 1960.

Detail view of Oregon Trunk Celilo Bridge T-0-4, October 1960.