Note 19 — Chapter XVII · VOYAGE FROM FORT UNION TO MUSCLESHELL RIVER, FROM THE 6TH TO THE 28TH OF JULY

Lewis and Clark so named this stream from the unusual number of porcupines seen near its mouth. The present Porcupine River is a branch of the Milk. The stream here so designated is now Poplar River, whose several branches have their rise on the southern border of Assiniboia; it flows nearly south into the Missouri, through Fort Peck Indian reservation. The station of Poplar, on the Great Northern Railway, is near its mouth.—Ed.