I think Rapids Riders is more MN focused, but they take trips to rivers in WI. The WI boating website is Badger State Boating Society (stands for Badger State Boating Society). Granted, BSBS is basically dead right now.
If you are looking for good whitewater close to Madison, you are basically out of luck. All of the good/decent rivers are in Northern WI at least a 2.5hr+ drive away. You should check out the American Whitewater pages for the Red River, Wolf River, Peshtigo River, Menominee River, Pike River, etc...They are all WI classics. There is also a decent dam released whitewater playpark/slalom course in Wausau, WI. There is a recreational release at Wausau this coming weekend. You will find TONS of other boaters at Wausau releases.
The rapids riders site has the graphs and a decent forum. The Wolf section 3 at the currently listed levels is high quality II/III-. Section 4, which is a fee area (on a reservation) is better. Go up and camp at Bear Paw and paddle either or both.
The community out there is fun. I paddled with them for 4 years. Throw up a post and see what peeps are paddling. There are sure to be paddlers on the wolf at least.
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