The flat-decked USGS skiff in Rapid No. 20. Rapid No. 20 heads at Mile 203.15 and drops 8 ft. in .15 miles. The boat is at the lower end of the island. Compare 64-3-31 CTCN 203-13
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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