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"The temperature immediately below the surface was estimated to be in the low 50s. Immersion in cold water can quickly numb the extremities and make it difficult to swim.
"The mountain lake water may not seem as cold on the surface, but the more you get into the water, the temperatures plummet rapidly," Garfield County Deputy Kevin Moore said in a release.
"Tragically in this case the water temperature, along with the undergrowth vegetation, caused the drowning of a very strong and skilled swimmer," Moore said. "We strongly urge anyone that plans to swim in any mountain lake that they always wear a life preserver."