Around 5700 BC Mt. Mazama, one of the tallest mountains in what is now the Northwestern US, underwent a cataclysmic eruption. The result was a hollow mountain with its top missing. Over time it has filled with rain and snow forming a crystal-clear lake almost 2,000 ft deep, the deepest in the US and 7th deepest in the world. The lake lies in one of the heaviest snowfall areas in Oregon, averaging over 500 inches per year. A 30 mile road circles the rim of the lake accessed by paved roads from the north and the south. In winter, the north access road and the rim road are under several feet of snow and are closed, usually until June. Our first attempt to go up the south road, on March 30, had to be aborted because
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