The Channeled Scablands of Eastern Washington the Geologic Story of the Spokan
The Channeled Scablands of Eastern Washington the Geologic Story of the Spokan
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A large lobe of ice from Canada reached the south end of present-day Flat- head Lake, and at this point its rate of melting was greater than its rate of advance. Its terminus became part of the north shore of Glacial Lake Missoula, and its meltwater poured in the lake. Al- pine glaciers in the Bitterroot Range added their meltwater, 11 and summer rains and snowmelt also helped to raise the level of the lake. Eventually, the lake level reached the lip of the ice dam and began to overflow. One ca...n only guess at the details from this point until the dam was breached completely, but some aspects of the event can be surmised. The overflowing stream must have cut deeply into the ice. As 'the outlet was quickly lowered, the water roared through the breach, probably widening the channel very rapidly by undercutting the sides until the dam collapsed. No doubt huge icebergs were fer- ried away by the stream. Within a very short time perhaps no more than a day or two the ice dam was destroyed and the con- tents of the lake were released.
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