Northern Pacific mainline and bridge at Kelly Butte, Washington, in May 1969. Looking down single track toward truss bridge. Photo by J.M. Fredrickson . Other Subject Classes: track, bridge, mountains

Northern Pacific bridge at Deep Creek, Washington Territory, 1887. Timber trestle and truss span west of Cle Elum. Photo by I.G. Davidson, J.M. Fredrickson collection. Other Subject Classes: bridge,

Northern Pacific bridge near Cle Elum, Washington Territory, in 1887. Timber trestle, mainline. Photo by I.G. Davidson, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

Northern Pacific bridge at Buckley, Washington, circa 1905. Looking west at long curving timber trestle over White River, mainline. Photo by E. Skamser, J.M. Fredrickson collection.. Other Subject Classes: bridge, track

Northern Pacific bridge 61.1 at Arlington, Washington. Looking northeast at bridge 61.1 over Stillaguamish River; Washington State Highway 9 to the left; photograph sequence TRWahl0213, 0247-0249. Other subject categories: Bridge-Truss, Right-of-Way, Structure

Northern Pacific bridge 61.1 at Arlington, Washington. Looking northeast at bridge 61.1 over Stillaguamish River; Washington State Highway 9 to the left; photograph sequence TRWahl0213, 0247-0249. Other subject categories: Bridge-Truss, River, Structure

Northern Pacific bridge 61.1 at Arlington, Washington. Close-up of pier of bridge 61.1 over Stillaguamish River; photograph sequence TRWahl0213, 0247-0249. Other subject categories: Bridge-Plate Girder, pier, Structure

Northern Pacific bridge 61.1 at Arlington, Washington looking northwest over Stillaguamish River; Washington State Highway 9 to the left. Other subject categories: Bridge-Truss, Highway, Highway, Structure

Northern Pacific bridge 61.1 at Arlington, Washington. Close-up of pier of bridge 61.1 over Stillaguamish River; photograph sequence TRWahl0213, 0247-0249. Other subject categories: Bridge-Truss, pier, Structure