Yes, the population densities of some of the fish species seem to fluctuate from year to year because I think they let the water levels in this flowage fluctuate drastically throughout the year but overall it is a good place to fish.
It's a flowage so there are stumps everywhere outside of the main channels. Careful with that prop!
Crappies, walleyes and perch move back and forth from channel to stump fields throughout the day. Generally the edges of the channels are the best places to look for them and it could take a little looking to find them. Northerns are abundant. The scenery and overall fishing experience are usually very good.
Fishing Hotspots has a map available and you really need it just for navigation even if you don't fish.

I have never seen ski activity on this flowage and I doubt anyone would be brave enough to attempt it. Most of the motor boat crowd sticks to the channel and main basin. With a canoe you will be able to sneak away into some solitude. If you're planning on camping it has been first come first serve and they do fill on weekends. In my experience I would say that this is the least congested body of water in this area of all others of similar size.

That's some key information that i couldn't get from the dnr contact. Can find solitude with a canoe away from main channel and comparatively not very congested BUT can have problem getting a campsite (there aren't very many). Having to share a spot would suck so would try to pick arrival on a non-peak time and day. That water level chart is pretty cool. I noticed the Big Eau Pleine is on there too. Just seeing the name brought back some great 40+ year old memories of fishing there while visiting my great aunt & uncle who lived nearby. Check out Turtle Flambeau too. excellent. glad i asked  thanks KF & Gavia ! up