A colored photographic postcard. At the top left in red is the legend "Columbia River from St. Peter's Dome, Castle Rock in distance". In the foreground a man wearing a gray hat, red shirt, green-gold overalls, and black boots kneels at the top of a cliff on a formation identified as St. Peter's Dome. Below him is a steep but forested slope to the Columbia River below. At the bottom of the slope but further along the river is a segment of what appears to be a road or railroad right-of-way. Behind the man is a small waterfall. Beyond him is a view along the river, with Castle Rock half-obscured on the opposite shore, and mountains rising in the distance.