Note 33 — Chapter XVII · VOYAGE FROM FORT UNION TO MUSCLESHELL RIVER, FROM THE 6TH TO THE 28TH OF JULY
Hannibal Evans Lloyd translation
The Musselshell, a principal southern tributary of the Missouri, rises east of the Big Belt Mountains, and flows east and north-east, parallel to the Yellowstone; it thence makes an abrupt turn northward into the Missouri. Lewis and Clark give its Indian name as "Mah-tush-ahzhah."—Ed.