A tinted photographic postcard. The legend in red at the top reads "St. Peter's Dome, Columbia River, Oregon." The pillar of rock stands out in the landscape, with its dome-shaped top and stratigraphic layers. The tall formation bears scattered trees and plants. In the foreground of the photo is a forested cliff with a waterfall gushing out halfway down the slope. In the water by the near bank of the river is a steamboat. On the right side of the picture we gaze down past the woods to the river banks and a view of the Columbia and one of its islands. On the far shore are mountains.