Give Blackwell a shot, there's a public boat launch there as well as rental boats w/trolling motots (I think the rentals start in May). Blackwell is in the Wheaton/Warrenville area just east of rt. 59 on Butterfield Rd (rt. 56). Some nice fish in there, best of luck to ya.
For private boats you need a permit from the Forest Preserve Dist, that will cost you like 30 bucks if u live in DuPage in order to launch at Blackwell. Clear water there is still pretty cold, best fishing is usually on overcast days. There are still some Trout swimming around from the stocking early this month, they will bite on wax worms fished 3 ft below a bobber.
Where can I get one of those Forest Preserve stickers 5 I did not know that. Even when I think I know all the rules, I don't. As far as Blackwell is concerned, does this permit replace the launch fee they charge?