Following down the river bank through a deep cañon of volcanic rocks, in many places broken in huge fragments, we presently came to rapids, having a fall of perhaps 40 feet in a half mile. At this point the channel narrows to 150 feet, and is shut in by perpendicular rocks. We were obliged to scale the ridge above, and follow down the steam on its summit, through dense timber and steep ravines, with considerable difficulty. In three miles we reached a level bottom, on the river, at the junction of a large creek coming in from the northeast. Camped at the junction. Distance 18 miles.〔''The report of Lieutenant Gustavus C. Doane upon the so-called Yellowstone Expedition of 1870'', presented to the Secretary of War, February 1871〕