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On this day in Lewis & Clark history...

Lewis and Clark are at the Great Falls of the Ohio at Louisville, Kentucky. During this period, arrangements are made to pilot the keelboat through the rapids here.

From the journals...

There are three channels in the rock through which the water passes; the principal one is nearest the right shore, the middle next best, that next the town is dry a considerable part of the year.

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.