Downstream in Cataract Canyon from Mile 183.7 to 182.8. The beach where the river disappears is at Dark Canyon. Compare the beach and ledges with Marston photo 5810 CTCN 183.17
Papers of Otis R. Marston: Still images, 1870-1978. vols. 1-40, Colorado River and tributaries (Headwaters to Lee's Ferry) The Otis Marston Colorado River Collection
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