Rockdam river, United States (Google Maps ⧉, OpenStreetMap ⧉)
Referenced In
History of the Expedition under the Command of Captains Lewis and Clark / To the Sources of the Missouri, Thence Across the Rocky Mountains and Down the River Columbia to the Pacific Ocean
by Meriwether Lewis, William Clark"As he went down the river he crossed at the distance of a mile a creek from the right, which from the rocks that obstructed its passage, he called Rockdam river."