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On this day in Lewis & Clark history...

Lewis and Clark are within two days of Fort Massac. Near this date, they would need to steer the keelboat around the long islands then called The Three Sisters.

From the journals...

The Three sisters, islands, Channel past the first on the right side, the second on the left side, the third on the right side.

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.