View of Cape Horn on the Washington side of the Columbia River Gorge, looking up the Columbia River. OHS Collection includes 1 duplicate of this mammoth plate on a different mount, with the alternate title, "Cape Horn Below the Cascades."

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 Castle Rock, also known as Beacon Rock, on the Washington side of the Columbia River Gorge. Photo taken from the Oregon side of the gorge. There are 2 structures, possibly houses, on the shore of the Columbia River.

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.

View of Castle Rock, also known as Beacon Rock, on the Washington side of the Columbia River Gorge. Photo taken from up river on the Oregon side of the gorge. Railroad tracks in the foreground.

Left panel of Carleton Watkins' 3-part panorama of Portland, Or., 1867. Mount St. Helens is in the background.

Left panel of Carleton Watkins' 3-part panorama of Portland, Or., 1867. Mount St. Helens is in the background. Duplicate of Mammoth 402, on a different mount.

Left panel of Carleton Watkins' 3-part panorama of Portland, Or., 1867. Mount St. Helens is in the background. Duplicate of Mammoth 402, on a different mount.

View of Cape Horn across the river on the Washington side of the Columbia River Gorge, taken from Bridal Veil, Oregon during the winter storm of 1884-1885. This plate is part of an album of Watkin’s New Series photographs originally owned by Charles H. Prescott, manager of the Oregon Railroad and Navigation Co.

Boudoir card of the Upper Cascade Rapids on the Columbia River. A structure overlooks the rapids. A railway is also visible in the background. Photograph is inscribed incorrectly with the date "1867."

Boudoir card of the Upper Cascade Rapids on the Columbia River. A railway is visible in the background.

Boudoir card of the Upper Cascade Rapids on the Columbia River.

Boudoir card of islands in the Columbia River, near the Upper Cascade Rapids. Part of a railroad is visible in the foreground. Buildings are visible on the opposite shore. Photograph is inscribed incorrectly with the date "1867."

Boudoir card of Castle Rock (also known as Beacon Rock) across the Columbia River on the Washington side of the Columbia River Gorge. Photo taken from Oregon side of the Gorge. There is a railroad in the foreground.

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 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.

Left panel of Carleton Watkins' 3-part panorama of Portland, Or., 1867. Mount St. Helens is in the background. Duplicate of Mammoth 402, on a different mount.

View of Mt. Adams, taken from Sunset Hill, south of The Dalles. The Columbia River is in the foreground.

View of a distant Mount Hood, rising over the Columbia River. In the foreground, long fences encircle a property with several wooden structures. Taken from the south side of Government Island.

Boudoir card of a panoramic view of Seattle, taken from Denny's Hill in 1882. This is the 3rd section of this panoramic view.

Boudoir card of a view of Port Gamble, Puget Sound, Washington Territory. There are several ships in port, and logs float on the bay in the foreground.

View of a distant Mount Hood, rising over the Columbia River. In the foreground, long fences encircle a property and a log cabin. Taken from the south side of Government Island. Loose, cropped duplicate plate in 5/1. Condition note: Exposure has faded and Mount Hood is barely visible. This plate is part of Carlton Watkin's "Sun Sketches of Columbia River Scenery" album.

View of Cape Horn on the Washington side of the Columbia River Gorge, looking up the Columbia River. Loose, cropped duplicate plate in 5/1. This plate is part of Carlton Watkin's "Sun Sketches of Columbia River Scenery" album.

View of Cape Horn on the Washington side of the Columbia River Gorge, looking down the Columbia River. There is a fence and large tree stump in the foreground. Loose duplicate plate in 5/1. This plate is part of Carlton Watkin's "Sun Sketches of Columbia River Scenery" album.

View of Castle Rock, also known as Beacon Rock, on the Washington side of the Columbia River Gorge. Photo taken from the Oregon side of the Columbia River Gorge. There are 2 structures, possibly houses, on the shore of the Columbia River. This plate is part of Carlton Watkin's "Sun Sketches of Columbia River Scenery" album.

The Cascades rapids of the Columbia River. The blockhouse at Fort Cascades is in the background. Loose duplicate plate in 7/1. This plate is part of Carlton Watkin's "Sun Sketches of Columbia River Scenery" album.

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.

Photo album, "Sun Sketches of Columbia River Scenery," containing photos by Carleton E. Watkins. Album page bears signature of Charles H. Prescott, dated 1884. Prescott was the original owner of this album, and manager of the Oregon Railroad and Navigation Co. A small biographical note appears alongside his signature. There is also an inscription from John Neilson Barry (b.1870), an Episcopal clergyman and historian from Portland, Or., to Julius L. Meier, governor of Oregon from 1931-1935. Inscription reads, "To the beloved Governor of Oregon Julius L. Meier whose noble and self sacrificing efforts in promoting the welfare of the people of Oregon have made him a public benefactor. J. Neilson Barry." Plates O.1. and O.45. are arranged out of numerical order. Plates O.28 and O.29 are not included.