Viaduct near Multnomah Falls, Columbia River Highway, Oregon. Caption on the back reads: Highway showing Castle Rock in the distance. Here the highway parallels the Columbia River and motorists pass in safety and comfort where heretofore pioneers struggled with hardships and privations. Castle Rock, formerly known as Beacon Rock, so named because it was to those old pioneers a beacon pointing the way to the end of their toilsome journey, can easily be distinguished in the background to the left.