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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 is likely staying with Clark at George Rogers Clark's cabin at Mill Creek.

From the journals...

When the water is low, the greater part of the rock becomes visibile, and it is then that the passage becomes dangerous.

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.