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David, I think the air mattress thing has a lot of merit, except in the Grand Canyon.
With the dam in place, the water is far colder year around, making a 'wet' crossings a very 'ify' proposition, and potentially life threatening.
I've taken my swims, intentional and otherwise, and would recommend against any prolonged immersion. Perhaps if you could, for the most part, stay on top of the mattress, it would be a workable deal.
IMHO.
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