Note 175 — LETTER IV
Reading edition
Dearborn River, named by Lewis and Clark (1805) for the secretary of war, was in reality a western affluent above, not below, the Great Falls. By "Fancy," De Smet probably intends the stream named by Lewis and Clark "Tansy," but now known as Teton River—a tributary, however, of Maria's River, although approaching very near the Missouri.—Ed.