Shaw et al. (1999) say that only one big flood went through the Channeled Scabland during the last glaciation. They also say this flood did not come from Glacial Lake Missoula; they propose that the water flowed southward from a reservoir beneath the Cordilleran ice sheet.

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These ideas clash with a wealth of evidence that Lake Missoula sent dozens of big floods through the Channeled Scabland (numbered examples in Figs. 1 and 2, and in Table 1).1 At the site of that lake, varved deposits record at least 34 occasions when Lake Missoula drained partly or completely after having...

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