Yes there is an actual boulder in Boulder Canyon. Shaded, bullet rock and at least three hard problems. It isn't very big but it's well worth a visit. The major drawback is crossing the river but bouldering season usually means the water is low.
Drive west on CO 119 7.2 miles from the intersection of Arapahoe and Canyon to a pullout near a cliff called the Inca Stone. Don't go past the sign reading "Boulder Falls 1000 feet. Look directly across the river for a low boulder in the trees. Crossing the river might be easier upstream, near another pullout on the south side of the road. There are four, maybe five distinct problems. Most people will want to try the Graham aretes. The rounded egg-like one just left of a short corner is supposed to be V10. The other arete just left of a steep clean wall is V11. Whatever the grade, both look a lot easier than they are.
Mountain Project's determination of some of the classic, most popular, highest rated routes for Boulder Canyon Boulder:
Start on the large positive undercling on the left side of the boulder and crimp your way up the short prow. Dave did the FA but a foot broke a year later and made the problem harder....[more]Browse More Classics in CO