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On this day in Lewis & Clark history...

When Dr. Patterson, a chronic alcoholic, fails to appear by 3pm, Lewis sets out down the Ohio without him. During the night, it rains so hard that Lewis is unable to keep the cargo dry.

From the journals...

it began to rain very heard and continued to rain most powerfully all night with small intervals: had my perogues covered with oil-cloth, but the rain came down in such torrents that I found it necessary to have them bailed out freequently in the course of the night; in attending to the security of my goods I was exposed to the rain and got wet to the skin as I remained until about twelve at night, when I wrung out my saturated clothes, put on a dry shirt turned into my birth; the rain was excessively could for the season of the year—

Meriwether Lewis
Snippet from a book used by Meriwether Lewis to help navigate the Ohio River

Picture from The Navigator: Or, the Trader's Useful Guide in Navigating the Monongehela, Allegheny, Ohio and Mississippi Rivers by Zadok Cramer, Fifth Edition, published in 1806. Lewis used an earlier edition to help him navigate and describe the journey down the Ohio River.