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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 notable landmarks such as Cave in Rock and Hurricane Island near present Elizabethtown, Illinois.

From the journals...

Rock in Cave, and island, channel right side, This is a curious cave, it presents itself to view a little above the level of the surface of the water when high, and close to the bank of the river, on the right side, a little darkened by the shade of some trees which stand before its mouth. It is about 180 feet deep, and its mouth is of a semicircular form, about 80 feet at its base and 25 feet in height. The cave bears the inscriptions of the names of persons who have visited it at different times and the dates, &c.

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.