Wildlife
American beaver
Castor canadensis
Habitat
Missouri and all points west
Conservation
Secure
First Observed
1805-04-18
Nearly wiped out by the fur traders that followed the Corps, beaver are again plentiful throughout North America.
Recent sightings
Where it’s being seen today
18 research-grade iNaturalist observations between 2006–2026. Most recent: 2026-03-27. Sourced from Terrain360 trail captures, cached locally.
Journal References
15 journal entries mention American beaver
Apr
26
1805
Yellowstone-Missouri confluence — John Ordway: April 26, 1805
...pleanty, viz. buffaloe Elk
Deer Goats Some bair. pleanty of beaver, fish &C and a beauti-
ful country around in every direction, considerable of timber
Such as cotton...
May
19
1805
Seaman Bitten by a Beaver — Nearly Dies
... Montana. Lewis recorded that Seaman was "badly bitten by a beaver" after apparently catching or cornering the animal near the water's edge. The beaver severed an art...
Aug
6
1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 6, 1805
a clear morning. we Set out as usal, and proceeded on hall- ing the canoes up the rapids. the bottoms low and covered with Small...
Aug
6
1805
Jefferson/Beaverhead River near present-day Dillon — John Ordway: August 6, 1805
... it to a pole at the forks. But the pole
was green, and the beavers cut it down before Clark's arrival. In ignorance
of Lewis' note Clark proceeded, with great diffic...
Aug
6
1805
Jefferson/Beaverhead River near present-day Dillon — Patrick Gass: August 6, 1805
see if the canoes had come up that far, and came upon the north branch about 2 miles above it. Here we discovered that the...
Aug
7
1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 7, 1805
a clear cool morning. one man out to hunt. we unloaded one of the Small canoes and halled it out in a grove of cotton...
Aug
7
1805
Jefferson/Beaverhead River near present-day Dillon — Patrick Gass: August 7, 1805
which was fair and clear, and where Capt. Lewis took a meri- dian altitude, which made the latitude of this place 4§ 2 53 north....
Aug
7
1805
Jefferson/Beaverhead River near present-day Dillon — John Ordway: August 7, 1805
one of the Small canoes and hailed it out in the bushes in a grove of cotton timber on L. Side of the forks and...
Aug
8
1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 8, 1805
a clear cold morning. 4 hunters Sent out eairly to hunt. we Set out at Sunrise, and proceeded on passed beautiful Smooth prarie on each...
Aug
8
1805
Jefferson/Beaverhead River near present-day Dillon — John Ordway: August 8, 1805
...he prarie is covred with grass which
is high in places, the beaver abounds on these Rivers, they
have dams and ponds &. C. &. C. in different places, the Soil
of thes...
Aug
8
1805
Jefferson/Beaverhead River near present-day Dillon — Patrick Gass: August 8, 1805
...ke did not get
the note left at the point, which was that a beaver had cut
down and dragged off the pole, on which I had fixed it.
Aug
9
1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 9, 1805
...d of it Soon. Some Thunder. the
Musquetoes troublesome. the beaver pleanty as usal &c.
Saw Snow on the Mountains Some distance a head. pro-
ceeded on passed the old b...
Aug
9
1805
Jefferson/Beaverhead River near present-day Dillon — John Ordway: August 9, 1805
...n a fiew days.
Some thunder the Musquetoes troublesome, the beaver as
pleanty as usal, &.C. Saw Snow on the Mountains Some dis-
tance a head, proceeded on passed the ...
Aug
9
1805
Jefferson/Beaverhead River near present-day Dillon — Patrick Gass: August 9, 1805
with some dew; proceeded on till g o’clock when we halted for breakfast. Here one of the hunters came to us who had been out...
Aug
10
1805
Jefferson/Beaverhead River near present-day Dillon — Joseph Whitehouse: August 10, 1805
... and Camped on the Star? Side.
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CHAPTER Kia
FROM THE BEAVER’S HEAD TO THE GREAT DIVIDE
August 11-16, 1805