Preliminary health & wellness studies report that an effective cold plunge may be completed at temperatures ≤ 15 °C (59 °F) for at least 15 minutes per week, with submersion up to the neck. An average snorkel survey takes ~45 minutes and includes partial submersion of the entire body, including the neck, face, and head.
**Disclaimer: Whether in a kiddie pool or an Idaho tributary, cold plunges are taken at one’s own risk. Most snorkelers don a fashionable wet suit, gloves, and hood made of 5+ mm of neoprene. This, however, does not keep whitewater from penetrating holes worn in through the fingertips, knees, and elbows during a typical season of underwater rock climbing.
The average temperatures for each subbasin (and corresponding drainage) surveyed by our 2023 Nampa crew are as follows:








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