History of the Grand Canyon
"The region is, of course, altogether valueless … after entering it there is nothing to do but leave. Ours has been the first, and will doubtless be the last, party of whites to visit this profitless ...
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There are exploratory adits just above the river where they were looking for the right location to put a dam in around the mid 60's. This is about 30+ miles downstream from Lee's Ferry in Marble Canyon.
