A handful of years ago I picked up an official Wiscosin map of all of the brooks, streams and rivers that were known to the Wisconsin DNR to possess trout. I distinctly remember a stream (or maybe even TWO streams) that fed into Lake Geneva that were highlighted.
Along the northern edge of Indiana, slightly east of center of the state, The Little Elkhart and Pigeon Rivers are supposed to have good fishing for Rainbow Trout. When I drove to Detroit from Chicago, it took me about three to three-and-one-half-hour of driving. Looking at a map, these rivers are not even half the distance. Perhaps an alternative to the well-known creeks a bit west of Madison, Wisconsin.
P.S. - Up until the mid 1930's, there was still a remnant population of NATURALLY PRODUCING, NATIVE Brook Trout in the Kishwaukee River in Illinois, around Marengo, Belvidere and Rockford. Driving along the Kish in those parts, it is not diffucult to image their presence. It is very sad they disappeared.