From the Introduction: The Falls of the Ohio River is at the McAlpine Dam between Louisville, Ky., and Jeffersonville and Clarksville, Ind. The Falls is essentially within the State of Kentucky, since the state boundary was established along the north bank of the Ohio River, but access to the Falls is now almost exclusively through Jeffersonville. The Falls of the Ohio was a strategic location during the early history of the Midwestern United States, for it was the only place along "La Belle Riviere" that required a portage for boats and served as a natural fording place. Evidence of Indians traveling in the area has been found, especially along the wide path known as the Buffalo Trace that was used by early explorers and animals. The French explorer LaSalle stopped at the Falls in 1669, and George Rogers Clark, enroute to his capture of Kaskaskia and Vincennes, established the first settlement at the Falls in 1771.
Powell, R. L., 1970, Geology of the Falls of the Ohio River: Bloomington, Ind., Department of Natural Resources, Geological Circular 10, 45 p., 13 figs., 2 app.
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