This large boulder sits above the equestrian trail, on the hillside a few hundred yards south of Big Rock. The walls are northwest facing and south facing, with four bolted lines and several TR problems. The composite of the rock is the same as Big Rock but the climbs are more about balance and traditional face holds, with little smearing. One nice departure from other climbs in the area, this boulder has a nice, fractured patina covering the upper section, just past the crux of most of the climbs. The hard routes are on the northwest face and west prow, "protected" with manky bolts. The moderates are on the south face and well-protected with new bolts and a great two-bolt rap anchor.
Getting There
To reach the Unknown Boulder (clearly visible from the open area in front of Big Rock) follow the equestrian/hiking trail on the west side of the valley, up into the hills to the south. Cross three modern wood bridges (thank you Boy Scouts) and pass a park bench. At the last hairpin turn before the summit ridge, follow the faint trail left and up to the base of the boulder. Allow five minutes easy hiking from the base of Big Rock.
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