Abstract
If a "Spokane Flood" ever occurred, and if the valley system of eastern and central Washington was already in existence, these valleys must have become channels and abnormal deposits of great magnitude must have been formed. This paper calls attention to such deposits along the western margin of the scabland-both in Columbia Valley, a main discharge route, and in Yakima Valley, a capacious tributary valley entering from an area unaffected by the flood. Three extraordinary situations are given especial attention: the mouth of Moses Coulee, the Columbia Valley deposits near Trinidad, and the truly astounding features in lower Yakima Valley. The conclusion is reached that nothing short of a catastrophic flood can explain these features. Skepticism can be justified only by the construction of workable alternatives.
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