Missouri River through Dakota territory — Patrick Gass: September 9, 1806

passed the mouth of the great river Platte; went on very well
all day, and at night encamped on a sand beach opposite the
Bald-pated prairie.
W ednesday 10th. We had a pleasant morning, embarked
early and went on very well. At 4 o’clock P.M. we met a
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periogue with four men, going to trade with the Loups or
Wolf Indians, who live up the river Platte. We remained
with these men about an hour, got some whiskey from them,
and then continued our voyage. In a short time we met
another periogue and seven men, going to trade with the
Mahas, who ltve on the Missouri. We staid some time with
these men, then proceeded and at night encamped on a willow
island.