Cold water is such a concern that everyone has to wear a wetsuit. “When you get in really cold water, it can shock the body,” guide Claudia Wiese told the four occupants of her raft one day in early June. “So we just want to prevent that by getting in the water ahead of time, so you know what to anticipate.”Soon after, Mike McSweeney, 25, jumped in the frigid water and the guide asked his girlfriend, Kayla Gewecke, 24, to pull him back on the boat.

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Persons: Claudia Wiese, “, Mike McSweeney, Kayla Gewecke