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Journal entry · May 20, 1805
Missouri River near Musselshell River — Patrick Gass: May 20, 1805
Patrick Gass · Missouri River near Musselshell River · Thwaites Vol. Gass 1807 First Edition
The place today: Missouri River near Musselshell River
Passed a creek on the south side and about 11 came to the
mouth of the Muscle-shell river, a handsome river that comes
in on the South side. The water of the Missouri is becoming
more clear. We here spent the remainder of the day, having
come seven miles. Captain Lewis had an observation here,
which gave 47. 00. 24. North latitude: and Captain Clarke
measured the rivers. The Missouri here is 222 yards wide,
and the Muscle-shell 110 yards. The water of the latter is of
a pale colour, and the current is not rapid; its mouth is 660
miles above Fort Mandan.
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The NPS atlas for this night
upper junction point of Missouri and Musselshell rivers, MT
NPS campsite reconstruction (Bergantino)
About 7.7 miles of travel mapped this day (NPS’s reconstruction of the course)
From the NPS Lewis and Clark National Historic Trail Park Atlas, mirrored here on September 21, 2026. This copy is not authoritative; NPS remains the system of record. About the mirror
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