Yep I have fished them both….not this year though. 3 mile is a nice little lake with niced sized walleyes, crappies, and, bluegills with the panfish being targeted by most fishermen. Although a couple of years ago I caught I 7# walleye trolling crank baits there. Sorry I haven’t heard any accurate reports from this year.
12 mile I believe is in the process of being killed off due to over population of yellow bass. Atleast that is the rumor I have heard.
Hope this helps alittle I am sure someone else will have better info
Keith