I went fishing with Harlan from 4 Season last Friday and we went through there. I asked him about the one on the south side and he said that it wasn't too bad. I think, boy I am struggling, that he said the ones on the north(by the campground) did freeze hard last winter. He also pointed out some pits down by Carnes and said that it used to be good, but has been pressured and there isn't much in it anymore. I am trying to remember this, and maybe be off. I would give him a call and quiz him. He did explain it to me, but we did a lot of story telling, so it is hard to remember.
I myself have not fished any of them so this is all here say. I think that the one on the south end of Alton would be a nice one to try.