Note 49 — Chapter XVIII · VOYAGE FROM MUSCLESHELL RIVER TO FORT MC KENZIE, FROM JULY 28TH TO AUGUST 9TH

Now Birch Creek, named by Lewis and Clark for John B. Thompson, "a valuable member of our party. This creek contains a greater proportion of running water than common"—Original Journals, ii, p. 90. It is on the north side of the Missouri, rising in Bear Paw Mountain and running directly south.—Ed.