The body of a man who investigators believe was swept away by swift waters at Rock Island State Park has been found after four days of large-scale dragging operations.The missing man, John C. DeValk, 55, of Springfield, Tenn., was last seen Saturday when he was knocked down by fast-moving water at Twin Falls near the power plant and then swept downstream. He was in the area with his son around 6 p.m. Saturday. The area, on the White County side of the river, has cautionary signs warning of hazardous and swift-moving water.The body has been sent for autopsy and authorities are yet to confirm it is DeValk, although it is believed to be the missing man.The victim’s body was found on the Warren County side of the river just above the Sand Bar after he was apparently carried down stream by the current.