Thence it descends, for four
hundred and eighty poles, about eighteen and one-half feet, 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.
"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, added to the
decline during that distance, 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 in four
hundred poles is thirteen feet; within two hundred and forty poles,
another descent of eighteen feet; thence, in 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
distance 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.
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