Most of the property and location of the current Argosy Casino resides on what was formerly a log mill. (sp. Pierson Howell) It was not the bottoms because it was on the "protected" side of the levee. Never heard of any racing there.
Also, the following link from the Lawrenceburg Speedway website is interesting:
http://www.lawrenceburgspeedway.com/track_history.php