Pontoon No. 2 in Vulcan Rapid shortly after release from lines. The lining enabled the craft to avoid the rough water in the open part of the rapid but this photo shows the dangerous position reached with the unwieldy craft
Papers of Otis R. Marston: Still images, 1870-1978. vols. 56-104, Colorado River and tributaries (Grand Canyon to Gulf of California) The Otis Marston Colorado River Collection
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