Jon,
I fished it last winter in late March and couldn't keep the bluegills off my jigs! Had about 12" of ice then. FYI- the sled race track is right in front of the bar (where the access is) but there's plenty of water to fish away from the track.
Supposed to be walleye in there as well.
It's a great little lake, with hot food, beer and plenty of parking just off the ice. Also, lots of nooks and crannies to hide from the wind.
Sam