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Durango Bill's

Grand Canyon 3-D Tour



Boucher Creek to Crystal Rapid to Ruby Canyon
Grand Canyon Miles 96 to 104


3-D view of the
            Grand Canyon - centered at Mile 98

   This view to the northwest has Boucher Creek in the lower left corner with a remote section of the South Rim stretching out toward Havasupai Point in the distance. The North Rim at Point Sublime can be seen in the upper right corner.

   Slate Fault cuts left to right across the center of the picture. Of major interest to both rafters and geologists is Crystal Creek, which has developed along the fault. Crystal Canyon enters from the right edge and forms Crystal Rapid where it joins the Colorado River. Scorpion Ridge can be seen directly above the junction.

   Prior to December 1966 there wasn't much more than a riffle at the base of Crystal Creek. Then a six-inch rainfall generated multiple debris flows that included 18-inch diameter Ponderosa Pine Tree logs that were carried at least 8 miles down from the North Rim. The resulting debris fan created Crystal Rapid. Robert Webb and Peter Griffiths have documented 168 tributaries to the Colorado River in the Grand Canyon that have had debris flows in modern history, but Crystal is the most dramatic. (More on recent debris flows when we get down to Lava Falls at mile 179)

   There is always an argument as to whether Crystal or Lava Falls is the wildest rapid on the river, but historically, if you are going to have a problem on the river, Crystal is the most likely place. Page 376 "Grand Canyon Geology" by Beus and Morales has a photograph of a large motorized raft being completely swallowed by a standing wave in excess of "5 - 6 m."  (16.5 to 20 ft.) at Crystal Rapid. On occasion, rafting trips have celebrated surviving Crystal Rapid with an "ABC Party" (Alive Below Crystal).


3-D view of the
            Grand Canyon - centered at Mile 102

   View to the north-northwest with Scorpion Ridge in the center and the South Rim's Havasupai Point in the distance. Ruby Canyon enters from the left edge and joins the Colorado where the river bends slightly to the left before straightening out. The North Rimís Point Sublime is again visible at the right edge.

   The Crazy Jug Monocline/Fault has contributed to Tuna Canyon, which starts right of center and extends toward the top edge. The inner gorge is still composed of 1.7 billion year old basement rock although somewhat different than the Vishnu/Brahma Schists. The resistant Tapeats Sandstone forms the flattish shelf with the usual Paleozoic sequence above.
 
 
 Return to river miles 88 to 96

Continue to river miles 104 to 112

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