Hey bud,
Great Lakes. I can’t offer any advice on Burt, butninfish Mullet quite a bit in the summer. I’d try 12-22 feet in front of Aloha State Park. We slab the walleye there in the summer and regularly see good reports in the MI DNR fish reports for that area.
Also, the northwest end of the lake has a sunken island....comes up from 25 ft to about a 4’ large rock pile. This is a popular spot in the winter as well. FYI - Mullet and Burt take a while to freeze, they are super deep and have a pretty good river running through them. I’d check with a local bait shop ref. ice conditions prior to your trip.
Good luck