John,
I have fished for Smallies in the Little Miami, usually while kayaking with the family so my success rate is poor due to the noise. But I plan on fishing this spring and summer. I use Morgan's canoe rental (I get a kayak) and fish while I float down stream. I know in OH the land owner owns the river bottom so beware where you wade, you may be trespassing. If you float you are exempt from trespassing thus the kayak or canoe. I have had some success and heard that others do quite well on the Little Miami. Good luck