A nice singletrack out and back that follows a fork heads up a river. Beautiful scenery and some nice tight singletrack. Some technical sections but very ridable for experienced riders. Some sections may be difficult for novices. Not too steep until the 5.5 mile mark or so. Most opt to turn back at the log ride.
From Oakridge head out of town going west. Go right on Kitson Springs Rd. and then right on NF-21. Follow for a short while to Larison Cove Trail head on right before you cross the bridge at the south end of Hills Creek Lake.
http://www.singletracks.com/item.php?c=1&i=2244