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On this day in Lewis & Clark history...

Lewis and Clark take the keelboat down the Ohio River. Near this date, they pass the point where the river hills give way to large plains on both sides of the river. They would also pass or stay at Owensboro, Kentucky.

From the journals...

Between Harden's creek and Yellow Bank creek the low lands commence. The hills which higher up the river are uniformly to be met wirth either on the one side or the other, now entirely disappear, and there is nothing to be seen on either hand but an extensive level country.

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

Quotation and 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.