The Marias River Decision
At the confluence of the Missouri River and an unknown northern fork, the expedition faced a pivotal decision about which stream was the true Missouri. Choosing wrong could waste the season and demoralize the party enough to end the journey. While most of the men believed the muddy north fork was the Missouri, Lewis and Clark used geographic reasoning and information from the Mandan to identify the clearer south-flowing stream instead. Lewis later named the rejected fork the Marias. Their decision was confirmed days afterward upon reaching the Great Falls.
The expedition faced perhaps its most critical navigational decision at the confluence of the Missouri and an uncharted river (which Lewis would name the Marias). The wrong choice could doom the expedition.
“An interesting question was now to be determined; which of these rivers was the Missouri. To mistake the stream at this period… would not only loose us the whole of this season but would probably so dishearten the party that it might defeat the expedition altogether.”
Nearly every member of the party believed the muddy, north-flowing fork was the Missouri. But Lewis and Clark, reasoning from geographic principles and the descriptions given by the Mandan, correctly identified the clear, south-flowing stream as the true Missouri. Their judgment was vindicated days later when they discovered the Great Falls.
Read this entry in modern English AI-translated
The expedition faced perhaps its most critical navigational decision at the confluence of the Missouri and an uncharted river (which Lewis would name the Marias). The wrong choice could doom the expedition.
"An interesting question was now to be determined: which of these rivers was the Missouri. To mistake the stream at this period... would not only lose us the whole of this season but would probably so dishearten the party that it might defeat the expedition altogether."
Nearly every member of the party believed the muddy, north-flowing fork was the Missouri. But Lewis and Clark, reasoning from geographic principles and the descriptions given by the Mandan, correctly identified the clear, south-flowing stream as the true Missouri. Their judgment was vindicated days later when they discovered the Great Falls.
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