The nearly level trail, smooth and well maintained, crosses a series of water-spanning bridges and marsh-spanning planked walkways before arriving at the ice caves in the snowfields at the base of the 4,000-foot north face of Big Four Mountain. Hike to a stopping point beneath the tall, wide cirque headwall, dappled with snow patches and waterfalls. The ice caves are formed when the undersides of avalanche snowbanks melt from the action of water and wind. They vary in size and shape from year to year. They do not open until midsummer and are never safe to enter — ceilings have been known to collapse.
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