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Located on the hill's northern side, not too far from The Island, Joe Brown, or the Half Dome boulder, and fairly easy to incorporate into a circuit containing these areas, Harrison Boulder features some of the nicest-feeling rock on the hill. Although most of its "problems" are quite OTD and often toproped, "The Mug" (V4) is one exception, and is what most boulderers visit Harrison to tick. Often in the shade, steep, and with cool edges, "The Mug" is an atypical problem for Rubidoux. Too bad it's so short.
From the road on the northwest side of the hill (near The Island) walk down to the obvious, U-shaped boulder.
8 Total Routes
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Mountain Project's determination of some of the classic, most popular, highest rated routes for Harrison Boulder:
The Mug V4 6B Boulder, 10'
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