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Here's an even closer view. Our plan was to put in at river mile 21, the fork of the Marias and Missouri Rivers, and take out at mile 88.5, where Judith Creek enters the Missouri, about halfway across Map 3. The Marias posed the biggest navigational challenge Lewis had yet faced. Which was the Missouri? Both were wide and mighty at the time, but today the Marias is a relative trickle, so it's hard to relate to his confusion. Fortunately he guessed right.