Lewis’ dog Seaman alarms a large buffalo bull : " Last night we were all allarmed by a large buffaloe Bull, which swam over from the opposite shore and coming along side of the white perogue, climbed over it to land, he then ran up the bank in full speed directly towards the fires, and was within 18 inches of the heads of some of the men who lay sleeping, when he came near the tent my dog saved us by causing him to change his course ; we were happy to find no one hirt."

May 30, 1805

Rain hampered the progress of the explorers: " more rain has now fallen than we experienced since the 15^th of September last. This day we proceeded with more labour and difficulty than we have yet experienced; in the course of the day we passed several old encampment of Indians, from the apparent dates of which we conceived that they were the several encampments of a band of about 100 lodges who were progressing slowly up the river."

May 31, 1805

Lewis describes the White Cliffs area of the Missouri River Breaks, in Chouteau County, Montana: " The hills and river Clifts which we passed today exhibit a most romantic appearance. As we passed on it seemed as if those seens of visionary inchantment would never have and end; for here it is too that nature presents to the view of the traveler vast ranges of walls of tolerable workmanship, so perfect indeed are those walls that I should have thought that nature had attempted here to rival the human art of masonry had I not recollected that she had first began her work."