Definitely was not a dump, but did it look like a dump? Kind of.....
http://www.flickr.com/photos/uicdigital/6144414307/
There's actually another photo somewhere at ground level with a couple abandoned boxcars and overgrown grass with some patches of trash. I'm sure it collected all sorts of discarded items but I would say that its underutilized state was a minor moment on this site's history. Lots of other photos show it as a busy railyard, and the golf course obviously.
Funny thing is how relatives of mine that haven't been to Chicago in ages ask me if I played on that golf course. Quite the look of confusion on their faces when I tell them it's been long occupied by towers.