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.
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Mountain Project's determination of some of the classic, most popular, highest rated routes for Harrison Boulder:
The Mug V4 Boulder, 10 feet
Thumbelina 5.10a V0 R TR, Boulder
Featured Route For Harrison Boulder
The Mug V4 CA : Riverside/Orange Counties : ... : Harrison Boulder
On the east side of the boulder is this short- but-sweet (and steep) problem. Really a one or two move wonder, it's primarily worth adding to your Rubidoux circuit because it's not a slab problem. Give your feet and ankles a break from those dime edges and smears and pretend, for a moment at least, that you are at Hueco....[more] Browse More Classics in CA