For several days, Lewis and Clark try to determine which river—the Missouri or the Marias—is the true Missouri river. Because of the turbidity and temperature, all of the men conclude erroneously that the Marias is the true Missouri. Lewis and Clark, however, in complete isolation determine that the true course of the Missouri lies to the southern fork. Only much later would historians realize that the Hidatsa, traveling overland, would have entirely missed this fork of the river as it occurs in a great northern bend of the Missouri River. Lewis and Clark spend several days scouting a goodly distance up each river and making numerous observations. They finally conclude that the party must take the south fork......
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