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.

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 the S.S. George Vancouver traveling on the Columbia River, under than open Interstate Bridge, after being launched from the Vancouver Shipyard. A river boat can be seen next to the larger ship, and people watch from the short along the bottom of the frame (negative 9 of 10).

A child and adolescent, both wearing hats, stand on a bridge looking downward. The child in the foreground is holding fishing line and a branch. Behind them is a dirt road, trees, and a field (negative 2 of 13).

People stand on a beach in front of the Rogue River Bridge (also known as the Isaac Lee Patterson Bridge). Several people are holding fishing poles, and one man is bending downwards towards the ground (negative 15 of 15).

A view of the Columbia River in Vancouver, Washington. A ship, named “Seaglamor” can be seen at a loading dock, on top of which is a large warehouse building. The Burlington Northern Santa Fe Railway bridge over the river is in the distance (negative 8 of 17).

The Marion Street Bridge in Salem, most likely during construction. Looking north, the Union Street Railroad Bridge can also be seen crossing the Willamette River (negative 10 of 10).

Stereograph view of an Oregon Steam Navigation Co. steam locomotive approaching from the east on the company’s portage railroad around the Cascades of the Columbia River, Skamania County, Washington Territory, 1867. South of the locomotive are ruins of the High Bridge, built by the military in 1860 to cross the Hamilton Creek drainage, and the Chenoweth/Putnam tramway.

Duplicate of Stereograph 1265, on a different mount. Stereograph view of an Oregon Steam Navigation Co. steam locomotive approaching from the east on the company’s portage railroad around the Cascades of the Columbia River, Skamania County, Washington Territory, 1867. South of the locomotive are ruins of the High Bridge, built by the military in 1860 to cross the Hamilton Creek drainage, and the Chenoweth/Putnam tramway.

Stereograph view of an Oregon Steam Navigation Co. steam locomotive approaching from the east on the company’s portage railroad around the Cascades of the Columbia River, Skamania County, Washington Territory, 1867. South of the locomotive are ruins of the High Bridge, built by the military in 1860 to cross the Hamilton Creek drainage, and the Chenoweth/Putnam tramway.

Duplicate of Stereograph 1265, on a different mount. Stereograph view of an Oregon Steam Navigation Co. steam locomotive approaching from the east on the company’s portage railroad around the Cascades of the Columbia River, Skamania County, Washington Territory, 1867. South of the locomotive are ruins of the High Bridge, built by the military in 1860 to cross the Hamilton Creek drainage, and the Chenoweth/Putnam tramway.

Stereograph of the Oregon Railway & Navigation Co.'s bridge over Eagle Creek, Columbia River Gorge, Oregon, 1883

Stereograph of the Oregon Railway & Navigation Co.'s bridge over Eagle Creek, Columbia River Gorge, Oregon, 1883

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 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 2/83: "Hood River Crossing, Oregon."

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 2/83: "Hood River Crossing, Oregon."

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 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.

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.

Stereograph originally taken by Alfred A. Hart circa 1862-1869 and reprinted by Carleton Watkins, who acquired Hart's negatives in 1869. Hart was the official photographer for the Central Pacific Railroad, and this stereograph depicts one of the railroad's trestle bridges in California.

Stereograph originally taken by Alfred A. Hart circa 1862-1869 and reprinted by Carleton Watkins, who acquired Hart's negatives in 1869. Hart was the official photographer for the Central Pacific Railroad, and this stereograph depicts one of the railroad's trestle bridges in California.

View of a train with a steam locomotive in the Columbia River Gorge. Railroad tracks are visible on both sides of the river, and the ruins of a collapsed railroad bridge are in the foreground. Several people are visible on the train and on the ground.

View of the Tooth Bridge, located west of Eagle Creek in the Columbia River Gorge and part of the Oregon Steam Navigation Co.’s Oregon Portage Railroad. Two people pose with a mule and a cart on the tracks. No title on matted plate. OHS Collection includes 1 duplicate of this mammoth plate, on a different mount, with the alternate title, "Columbia River Near the Cascades."

View of the Tooth Bridge, part of the Oregon Steam Navigation Co.'s Oregon Portage Railroad in the Columbia River Gorge. The Cascade Mountains rise in the background. This plate is part of Carlton Watkin's "Sun Sketches of Columbia River Scenery" album.