Word: scourway
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...blocked the Mohawk and St. Lawrence valleys, there were two southerly outlets to the Great Lakes system, the present Wabash and Desplaines-Illinois valleys, both leading to the Mississippi. The latter ultimately robbed the former and a vast river, called Warren River after the engineer who traced its old scourway, carried the entire system's outlet. The Chicago canal follows that scourway, deepened but a few feet. There was, in the Warren River's day, a "Lake Chicago" spreading out over the present state of Michigan ; Huron, Erie and Ontario were a "Lake Warren" with an outlet across Michigan into...
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