Photograph of a train crossing the Sandy River bridge at Dodge Park, Bull Run. A total of eight passenger train cars can be seen crossing the trestle bridge, under which river rocks and water can be seen.

Photograph showing an unidentified covered bridge. A sign at the entrance to the bridge reads “WALK YOUR HORSE.” The text “Bridges - Clackamas County” is written on the negative sleeve.

Photograph showing an unidentified covered bridge over a river and the trestle leading to the bridge. The trestle and bridge are surrounded by forest. The text “Bridges - Clackamas County” is written on the negative sleeve. See related image No. 376G0146.

Photograph showing an unidentified covered bridge over a river and part of the trestle leading to the bridge. The text “Bridges - Clackamas County” is written on the negative sleeve. See related image No. 376G0145.

View of the Spokane, Portland, & Seattle Railway Willamette River Bridge. A handwritten note on the back for the photograph reads, "File 62 - SP&S Train crossing Willamette River Bridge."

Photograph taken from a side angle of a wooden and metal trestle bridge over the Molalla River. A person can be seen standing at the top of a hill in the distance. Railroad tracks appear to pass over the bridge.

Photograph of several automobiles crossing the bridge at Shepperd's Dell on the Historic Columbia River Highway in the Columbia River Gorge. Two people stand on either side of the bridge, looking over the railing. The people in the automobiles look toward the camera. Writing on the bottom of the print indicates a 1915 copyright by the Weister Co.

The Oregon Trunk Railroad bridge spanning the Crooked River Canyon. The photograph is taken from the floor of the canyon looking up at the bottom of the bridge and the canyon walls. A typed note on the back of the photograph reads, "Kiser 5462. Crooked River Canyon and Bridge (320 Feet High) O T Ry. One mile north of Terrebonne, Ore." Two stamps on the back of the photograph read, "From passenger department The North Bank Road, Portland, Ore." and "In reproducing this picture in any form, copyright notice must appear as follows, Copyright 1912 by Kiser Photo Co. for Spokane, Portland & Seattle Ry."

View of the Oregon Trunk (OT) Rail Bridge across the Columbia River near Wishram Washington. The bridge is also known as the Celilo Bridge. The photograph is taken from the bank on the Oregon side of the river and captures almost the full span of the bridge. A portion of Celilo Village is visible in the foreground. The community of Skien is visible in the distance at the base of the bridge on the Washington side. A note on the back of the photograph reads, "File No. 68 - OT/Celilo Bridge across Columbia River, near Wishram, Wash."

View of the Oregon Trunk (OT) Rail Bridge across the Columbia River near Wishram Washington. The photograph is taken from the tracks on the Washington side of the bridge looking south through the trusses. The bridge is also known as the Celilo Bridge. A note on the back of the photograph reads, "File No. 66 - OT/Celilo Bridge across Columbia River, near Wishram, Wash. Kiser 5475."

Photograph of the Oregon Trunk Railroad Bridge, also known as the Crooked River Railroad Bridge, above the Crooked River in Central Oregon. A construction worker and construction equipment are visible on the bridge. Taken from the shore of the Crooked River and looking up at the bridge. Writing on the front of the print reads, "Oregon Trunk R.Y. Bridge across Crooked River Central Oregon. Length: 340 ft., Height: 320 ft." A separate note reads, "No. 698, Copyrighted by O. Hedlund, Madras, Ore."

Photograph looking down the Sandy River trestle bridge, showing wood structure and railroad track. The hillside drops off on each side of the track, showing trees and stumps.

View of the first Steel Bridge across the Willamette River. The Union Station clock tower is visible behind the bridge.

A view of the Clackamas River in Estacada, Oregon. Houses are visible on a hill and the Clackamas River and a bridge are visible below.

Photograph looking downstream looking towards the “island,” with a wooden suspension bridge visible. In front of the bridge a blurry man can be seen facing the camera. Beyond the bridge is a small wooden building next to several vertical poles. Written on the negative is “#60M. 10-10.”

Photograph showing the Clackamas River in the River Mill area, with numerous “islands” and cliffs. A wooden suspension bridge can be seen spanning two cliffs near the center of the frame, with numerous wooden buildings visible in the distance. Written on the negative is “#58M. 8-12-10.”

Photograph showing a suspension bridge over the Clackamas River in near the River Mill dam area. The bridge crosses between two tall cliff faces, beyond which the river can be seen around. Snow is on the ground throughout the image. Written on the negative is “Feb 3, ‘10, PES 2014.”

Photograph showing a partially completed suspension bridge over the Clackamas river near the River Mill Dam site. Cliffs and trees can be seen throughout the image. Written on the negative is “Dec 22, ‘09 – PES 2009.”

Photograph showing a bridge over the Clackamas River, taken from river level looking upward. In the background, a wooden suspension bridge can be seen across the cliffs behind the larger front bridge. Written on the negative is “Dec 22, ‘09 PRD 2007.”

Photograph taken from a side angle, looking across a suspension bridge at Cazadero Dam/Station G. The bridge leads to steps, which go to the top of the hill across the water. Several buildings and transmission poles can be seen at the top of the hill. On the left side of the frame, the edge of a brick building can be seen.

Photograph of the Oregon Electric Railway bridge over the Willamette River at Wilsonville, Oregon. The bridge is under construction. Taken from the shore of the river, looking at the bridge. Handwriting on the back of the print reads, "Oregon Electric Ry. Wilsonville Bridge nearing completion. Frederick Prahl, General Roadmaster (died 1909), 'in charge of construction,' 1906 - 07. Presented Jan 18, 1956 by Margaret L. Chappell - granddaughter, Addie M. Sliven - daughter, 2535 Willamette Blvd. Portland 11 Ore." Postmark stamp on the back of the print reads, "Wilsonville, Sep. 17 P.M. 1907, Oregon."

Photograph of a work train crossing a railroad bridge that is under construction. Taken from the bank of a river, looking up at the bridge. Wooden planks for construction float in the water in the foreground. Handwritten note at the bottom of the print reads, "Sep 12 - 07, First work train."

Photograph of 3 bridge piers under construction in an unidentified body of water. A railroad bridge, also under construction, can be seen on the far bank of the water, on the left, approaching the piers. Handwritten label on the bottom of the photograph reads, "Piers 2, 3 and 4 in background, May 1, '07."

A photograph of Multnomah Falls. The bow string truss bridge is visible. Trees and plants line the falls and a structure is visible in the bottom left corner.

Stereograph of the Oregon Railway & Navigation Co.'s railroad bridge over Hood River, circa 1883. Items 2/82 and 2/83 are duplicate stereographs on different mounts. Alternate caption on stereograph 2/82: "Hood River Crossing, Columbia River Scenery, Oregon."

Stereograph of a tooth bridge along the Columbia River Gorge.

Stereograph of the Tooth Bridge, located west of Eagle Creek in the Columbia River Gorge and part of the Oregon Railway & Navigation Co.'s railroad line on the Oregon side of the Gorge, circa 1882.

A view of the railroad bridge crossing Eagle Creek. Taken from Eagle Creek. Loose duplicate plate in 5/2. This plate is part of Carlton Watkin's "Sun Sketches of Columbia River Scenery" album.