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On this day in Lewis & Clark history...

After waiting for the fog to clear, the hired Captain steers the keelboat down the Ohio. The men push the boat over the first rapid. At the second rapid, the boat must also be unloaded. At the third rapid, oxen must drag the empty boat.

From the journals...

we passed the little horsetale ripple or riffle with much deficulty, all hands laboured in the water about two hours before we effected a passage; the next obstruction we met was the big-horse tale riffle, here we wer obliged to unload all our goods and lift the emty Boat over, about 5 OCock we reach the riffle called Woollery's trap, here after unloading again and exerting all our force we found it impracticable to get over, I therefore employed a man with a team of oxen with the assistance of which we at length got off

Meriwether Lewis
Snippet from a book used by Meriwether Lewis to help navigate the Ohio River

Picture from The Navigator: Or, the Trader's Useful Guide in Navigating the Monongahela, 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.