The St. Joe runs thru South Bend, if memory serves me there is a dam there where a lot of wading anglers fish.
If you want a better wading experience Trail, Salt creek and the Little Cal river are within 2 hours. They are a bit of a pain to fish(small snaggy and brushy) but hold a goodly amount of fish.
You are a couple of hours from the Muskegeon river in Michigan great fly fishing river withgreat Trout, Salmon and Steelhead fishing.
PM me and I could point you in the right direction.