Island Campground will have open spots after the high water. At 11′ it starts to get hard to get in (and more importantly) out. If you do check them out, ask about the lot levels. I was boating to my camper last year at 12.5 which was two inches on my camper tires, but I would of had water in my pickup cab getting to it.
Here’s a list of what’s open. You’ll have to go to the map to see the location on the island. Good people there.
http://www.islandcampingandmarina.com/Todaysnotice.html
There’s a campsite in Bay City on the Bay City Flats, I don’t know much about it.
There’s one on Goose Lake as well, not too many sites. I haven’t talked to them either.
One option that might work out for you is Mr. Sippi. Good thing is they have a bar with pizza. Bad thing is they have a bar with pizza. LOL! It’s right across from the WI back channel ramp.
This might work out the best for you. I saw a tent there last fall for a month or so… Ask for Rat, the owner. (715) 792-2992