 Indian trading factors such as Matthew Lyon established their offices at Spadra, on the west end of Lake Dardanelle on the Arkansas River, a Clarksville location now occupied by Spadra Marina.A historical marker, dedicated in 1984, sits on Spadra Bluff, near the original river town of Spadra.The area was reserved for the Cherokee, so most early settlers of Johnson County did not move into the area until after 1828, the year the Cherokee gave up their land.