IMBA epic ride. Many trails to choose from. Goat dance, cliff**er, switchback, and toad road are all good. Easier singletrack around base of mounds and moderate to very difficult up and down the mounds. Rocks, sand, and roots will challenge any rider on the climbs. There is also a trailhead building with bathrooms and maps of all the trails. NASTI has done a great job marking trails and I hear there are new ones in the works. Bottom line: You won't be disapointed.
From Black River Falls, go north on hwy 12/27 for 10 miles to Merrillan. Take a right on hwy 95. Go about 7 or 8 miles to fisher rd, turn left or north. (Where couny hwy J goes south to Hatfield, Fisher rd goes north) Go north on Fisher rd for about one mile. Trail center is first dirt/gravel rd on left. Look for brown sign.
http://www.singletracks.com/item.php?c=1&i=1880