58 hwy north to Harrison Bay state park. Left off of 58, left 1 mile up rd at Park entrance, another left to marina parking lot.
Trailhead is marked.
Views of lake and swimming areas. Not worth the trip, even if you live close by. Nice trail except for the part about it being to flat. Ride it clockwise a few times and then counter clockwise. Don't expect this 4.5 mile loop to be technical enough to advance your riding skills as would a more rocky, twisty trail.