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To answer that question, I have to say first that it did not begin in St. Louis, because before Lewis met up with Clark, he began the expedition on August 30, 1803 in Pittsburgh PA. Lt. William Clark would offer to join Lewis on the expedition weeks later on October 13, 1803 at Camp Dubois (in present-day Indiana). They then named their team the 'Corps of Discovery'. From there, they sailed down the Ohio River towards St. Louis. The expedition then ended on September 23, 1806 upon their return to St. Louis from Oregon.

If you say the expedition began on October 13, 1803 when Clark joined in, the expedition took more or less 25,790 hours.

If you say the expedition began when Lewis first left Pittsburgh on August 30, 1803, then the expedition took more or less 26,880 hours.

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15y ago

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