levis trow
...
Camba trails.
I'm not 100% sure of driving times, but I think you could hit the CAMBA system in 2-3 hours, Levi's in about 1 hour from Wasau. In that ballpark.
Levi's was an IMBA Epic ride, Rock Lake trail in the CAMBA system is this year, fwiw. The criteria for that designation are:
"Demanding, mostly singletrack trail experience in a natural setting
Denotes a true backcountry riding experience in remote settings
One that is technically and physically challenging
More than 80 percent singletrack
At least 20 miles in length"
There are plenty of other places around, of various levels. Eau Claire has a pretty fun system at Lowes Creek Park, worth a day trip. But Rock Lake and Levi's are the two that come to mind as places that will keep advanced riders smiling.
I lived in I've ridden all over the midwest and the western USA. Other than the verticals coming in 100-200' sections (if you are lucky) instead of 1000-2000'+ sections, plenty of fun to be had in WI.