The Dearborn County Historical Society has a few pictures around. Also, in one of their Dearborn County History books there is an old picture from 1913 of the front stretch with a packed grand stand. I believe the caption stated that the track used be located almost right across the street....
...anyway...There is a woman named Chris there that is a Dearborn County Historian, and rumored to be a race fan, so if I'm able to track her down contact info, I will let you know!

Kim