Mental Rock has four very nice lines, all cracks. There seems to be very little traffic here, perhaps because the routes are not bolted and/or they are all very difficult. They're all very sustained and fairly technical, and harder than they look.
The routes are all north facing so it's a nice place to find shade on hot days. I suspect most people top rope the routes, and the top of the face is easily accessed via 4th class scrambling from the west side of the north face.
L->R
A. Love or Confusion?, 11, 1p, 40', gear. B. Obsessive-Compulsive?, 12, 1p, 40', gear. C. Manic-Depressive, 11+, 1p, 40', gear. D. unknown, 12-? TR, 1p, 40', gear or TR. E. Sleeper, 12, 1p, 40', gear.
Getting There
The rock is located on the south side of the creek and just past the Brick Wall. We were able to cross the creek easily in early September, but during high water one can cross the creek via the remnants of an old bridge just to the east of the rock. Either way, move along the creek until just under the north face and follow a faint trail up to the base.