An evacuation alert was also issued Friday for residents of the Lower Salcha River, from river mile 3 to 40. The Middle Salcha remains under a SET status, from river
Permafrost is ground that stays frozen year round; the permafrost in interior Alaska also has massive wedges of actual ice locked within the frozen ground. When that ice melts, the ground surface collapses and forms a sinkhole that can fill with water. Thus, a thermokarst lake is born. At first glance, Big Trail looks like any lake. But look closer and there's something disturbing the surface: bubbles.
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