Upon leaving
the Iron Mountain campsite of October 25, Whipple's survey party
approached an impassable section of the canyon and were forced to
interrupt their survey of the river and find a detour. Here's Lt.
Whipple's diary entry from Dr. David H. Miller's typescript:
Monday Oct.
27 [1851] "After walking a mile
(for mules could not be riden [sic] down the rocks,) and wading the
river twice the precipices of the cañon narrowed to 30 feet which pass
was blocked up by boulders 15 feet high between which the river dashed
in deep but narrow channels. The precipices upon each side were
estimated from 1000 to fifteen hundred feet in height. They were
beautifully worn into curious shapes and often terminated in spires or
towers as perfect as if formed by the hand of man. The sketch
by Mr. Wheaton shows the present termination of the
survey."
-Whipple
Collection, Oklahoma Historical Society