1 p. article describing the building of the Columbia River Highway, including construction details. The article also contains four photographs: one depicting the bridge at Shepperd's Dell, one depicting the entrance to the observatory tunnel, one depicting Mitchell's Tunnel through Storm Cliff; one showing the overlook at Crown Point on the Columbia River.
Article from Scientific American describing the building of the Columbia River Highway, including construction details. The article also contains four photographs: one depicting the bridge at Shepperd's Dell, one depicting the entrance to the observatory tunnel, one depicting Mitchell's Tunnel through Storm Cliff; one showing the overlook at Crown Point on the Columbia River.
