On the
19th, captain Clarke not being able to find the bear mentioned
in the last chapter, spent the day in examining the country
both above and below the Whitebear islands, and concluded that
the place of his encampment would be the best point for the
extremity of the portage. The men were therefore occupied in
drying the meat to be left here. Immense numbers of buffalo
are every where round, and they saw a summer duck which is now
sitting. The next morning, 20th, he crossed the level plain,
fixed stakes to mark the route of the portage, till he passed
a large ravine which would oblige us to make the portage farther
from the river: after this there being no other obstacle he
went to the river where he had first struck it, and took its
courses and distances down to the camp. From the draught and
survey of captain Clarke, we had now a clear and connected view
of the falls, cascades, and rapids of the Missouri.
This river is three hundred yards wide at the point where it
receives the waters of Medicine river, which is one hundred
and thirty-seven yards in width. The united current continues
three hundred and twenty-eight poles to a small rapid on the
north side, from which it gradually widens to one thousand four
hundred yards, and at the distance of five hundred and forty-eight
poles reaches the head of the rapids, narrowing as it approaches
them. Here the hills on the north which had withdrawn from the
bank closely border the river, which, for the space of three
hundred and twenty poles, makes its way over the rocks with
a descent of thirty feet: in this course the current is contracted
to five hundred and eighty yards, and after throwing itself
over a small pitch of five feet, forms a beautiful cascade of
twenty-six feet five inches; this does not however fall immediately
perpendicular, being stopped by a part of the rock which projects
at about one third of the distance. After descending this fall,
and passing the cottonwood island on which the eagle has fixed
its nest, the river goes on for five hundred and thirty-two
poles over rapids and little falls, the estimated descent of
which is thirteen feet six inches till it is joined by a large
fountain boiling up underneath the rocks near the edge of the
river, into which it falls with a cascade of eight feet. It
is of the most perfect clearness and rather of a bluish cast;
and even after falling into the Missouri it preserves its color
for half a mile. From this fountain the river descends with
increased rapidity for the distance of two hundred and fourteen
poles, during which the estimated descent is five feet from
this for a distance of one hundred and thirty-five poles, the
river descends fourteen feet seven inches including a perpendicular
fall of six feet seven inches.
The river
has now become pressed into a space of four hundred and seventy-three
yards, and here forms a grand cataract by falling over a plain
rock the whole distance across the river to the depth of forty-seven
feet eight inches: after recovering itself the Missouri then
proceeds with an estimated descent of three feet, till at the
distance of one hundred and two poles it again is precipitated
down the Crooked falls of nineteen feet perpendicular; below
this at the mouth of a deep ravine is a fall of five feet, after
which for the distance of nine hundred and seventy poles the
descent is much more gradual, not being more than ten feet,
and then succeeds a handsome level plain for the space of one
hundred and seventy-eight poles with a computed descent of three
feet, making a bend towards the north. Thence it descends during
four hundred and eight poles, about eighteen feet and a half,
when it makes a perpendicular fall of two feet, which is ninety
poles beyond the great cataract, in approaching which it descends
thirteen feet within two hundred yards, and gathering strength
from its confined channel, which is only two hundred and eighty
yards wide, rushes over the fall to the depth of eighty-seven
feet and three quarters of an inch. After raging among the rocks
and losing itself in foam, it is compressed immediately into
a bed of ninety-three yards in width: it continues for three
hundred and forty poles to the entrance of a run or deep ravine
where there is a fall of three feet, which, joined to the decline
of the river during that course, makes the descent six feet.
As it goes on the descent within the next two hundred and forty
poles is only four feet: from this passing a run or deep ravine
the descent for four hundred poles is thirteen feet; within
two hundred and forty poles a second descent of eighteen feet;
thence one hundred and sixty poles a descent of six feet; after
which to the mouth of Portage creek, a distance of two hundred
and eighty poles, the descent is ten feet. From this survey
and estimate it results that the river experiences a descent
of three hundred and fifty-two feet in the course of two and
three quarter miles, from the commencement of the rapids to
the mouth of Portage creek, exclusive of the almost impassable
rapids which extend for a mile below its entrance.
The latitude of our camp below the entrance of Portage creek,
was found to be 47° 7' 10" 3, as deduced from a meridian altitude
of the sun's lower limb taken with octant by back observation
giving 53° 10'.
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