Note 206 — LETTER VI
Reading edition
Beaverhead River is the main branch of the Jefferson, one of the three great sources of the Missouri. It runs through a mountainous valley in a county of the same name, in which is located Dillon, the chief town of southwestern Montana. The valley is named for a rocky point that bears a resemblance to the head of a beaver. Lewis and Clark were the first white men known to have visited this locality. The cliff they called "Beaverhead" is now known as "Point of Rocks," about eighteen miles north of Dillon. See Original Journals of the Lewis and Clark Expedition, ii, p. 321.—Ed.