"October
8 [1851], Camp No, 14.—
About a mile below the last camp the river falls over a
succession of horizontal ledges of sandstone, forming a
beautiful cascade of one hundred to one hundred and twenty feet
in vertical height, and continues on its course through a canyon
of that depth, the ground level of the banks remaining the same.
Having
been informed by my guide [Antoine Leroux] and other experienced
trappers that this canyon extends down the river to its junction
with the Colorado, and the great canyon through which the latter
flows, I regarded the attempt to follow this river to its mouth
as too hazardous, considering the condition of the animals and
the state of the supplies, and therefore, by the advice of the
guide, turned off toward the mountains, with the purpose of
striking the Colorado below the great canyon, and then exploring
it upward as far as might be found practicable."