View of Cape Horn on the Washington side of the Columbia River Gorge. Taken from the east at John Stevenson’s property. Log cabin and fence in the foreground. OHS Collection includes 1 duplicate of this mammoth plate on a different mount, with the alternate title, "Cape Horn On Columbia River."

View of Multnomah Falls on the Oregon side of the Columbia River Gorge. OHS Collection includes 1 duplicate of this mammoth plate on a different mount.

View of Multnomah Falls on the Oregon side of the Columbia River Gorge. OHS Collection includes 2 duplicates of this mammoth plate on different mounts.

View of Lower Multnomah Falls on the Oregon side of the Columbia River Gorge.

View of Castle Rock, also known as Beacon Rock, on the Washington side of the Columbia River Gorge. OHS Collection includes 2 duplicates of this mammoth plate on different mounts.

Distant view of Castle Rock, also known as Beacon Rock, across the Columbia River on the Washington side of the Columbia River Gorge. Taken from the McCrary farm in Oregon. OHS Collection includes 1 duplicate of this mammoth plate on a different mount.

View of a steamboat landing on the Columbia River. Steam blows out of a sternwheeler at the landing.

A steam locomotive passes a rail yard operated by the Oregon Steam and Navigation Company in the Columbia River Gorge. Several people in the rail yard look at the camera. OHS Collection includes 1 duplicate of this mammoth plate on a different mount with the alternate title, "Cascades Portage Railroad."

Two men pose on the S.G. Reed locomotive, a steam locomotive with one rail car attached. No title written or printed on plate.

View of the former garrison at Fort Cascades, near the Cascades townsite on the Columbia River in Skamania County, Washington Territory, 1867. Castle Rock, also known as Beacon Rock, is visible in the distance.

View of the Middle Landing of the Oregon Portage Railroad at the Cascades on the Columbia River. OHS Collection includes 1 duplicate of this mammoth plate on a different mount with the alternate title, "The Middle Landing, O.R.R. Columbia River."

View of the Middle Block House, also known as Fort Rains, on the Columbia River. OHS Collection includes 1 duplicate of this mammoth plate on a different mount.

View looking southwest down the Columbia River from the Middle Block House, also known as Fort Rains, in the Washington Territory. The Eagle Creek area is visible in the distance on the Oregon side of the river.

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.

A steam locomotive operated by the Oregon Steam and Navigation Company on railroad tracks in the Washington Territory of the Columbia River Gorge. Upper Block House, also known as Fort Lugenbeel, is on the left while a steamboat on the Columbia River is visible in the distance on the right.

View of the Columbia River Gorge from the Upper Block House, also known as Fort Lugenbeel, in the Washington Territory. View looks down the Columbia River. Railroad tracks border the river.

View of the Upper Block House, also known as Fort Lugenbeel, on the Columbia River in the Columbia River Gorge. Other buildings and a railroad bridge are also visible. OHS Collection includes 2 duplicates of this mammoth plate on different mounts. One duplicate bears Watkins' signature on the back and has the alternate title, "Upper Blockhouse, Cascades."

View of the Oregon Steam and Navigation Company's steamboat "Oneonta" at the Upper Landing of the Cascades, Washington Territory, 1867. A steam locomotive pulls a train in the background.

View of islands in the Columbia River in the Columbia River Gorge. A railroad bridge crosses the river to one island in the foreground.

View of islands in the Columbia River in the Columbia River Gorge.

View of the Cascade Rapids on the Columbia River, taken from the Oregon side of the Columbia River Gorge. Upper Block House, also known as Fort Lugenbeel, is visible in the background on the left.

View down the Columbia River from the Middle Landing of the Oregon Portage Railroad on the Oregon side of the Columbia River Gorge. The outline of Castle Rock, also known as Beacon Rock, is visible in the distance.

View of the Columbia River, taken near the head of Bradford's Island. Tree branch in the foreground. OHS Collection includes 1 duplicate of this mammoth plate, on a different mount, with the alternate title, "View Down the Columbia. Head of Bradfords Island. Cascades."

View from the sawmill at Eagle Creek on the Oregon Portage Railroad in the Columbia River Gorge. A house sits close to the river while a mule and 3 people stand on tracks to the right.

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 Oregon Steam and Navigation Company's operations at The Dalles, Oregon. The steamboat "Oneonta" is tied to the wharf.

View of The Dalles on the Columbia River, taken from the Washington side of the river. Mount Hood rises in the background. OHS Collection includes 1 duplicate of this mammoth plate, on a different mount, with the alternate title, "Mount Hood and Dalles City from Rockland. Columbia River."

View of The Dalles, taken from the Oregon side of the Columbia River, looking east. No title on matted plate.