St. Olaf and Beaver are about the closest natural lakes to where I grew up, so I hit them once in a while when I am back in Minnesota and the Mississippi backwaters aren’t iced over.
I made a road trip over to St. Olaf last January. I caught a bunch of small sunnies and crappies. That is typical of the panfishing for both lakes.
The DNR stopped stocking walleye in St. Olaf some years ago, but I have heard there are still a few large ones in there. Beaver has a decent population of walleye. The Northern fishing on St. Olaf is OK, based on my limited experience with it.