Hypothermia is one of the major hazards. The water temp is about 50F at Lees Ferry, and your muscles stop working after about 5 minutes in it without a wetsuit. People have died of hypothermia because they were too weak to swim to shore. This ice worm "boxer" was produced by air bubbles stuck under the ice in a pot hole. Each day the ice would melt just enough for the bubble to move a little.

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