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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, Lewis likely observed the ledge of rocks extending across the river and viewed the three channels cut by the Ohio River.

From the journals...

These rapids are occasioned by a ledge of rocks which extend quite across the river, and are hardly to be perceived by the navigator, in times of high freshes, unless by the superior velocity of the vessel he is in—

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.