There's at least one good problem that starts under the bulge. Several other face climbs are possible, but the top outs are pretty dirty and overgrown.
Drive down the main road toward the dam. Stay to the left and you'll end up at the boat ramp - the boulder is about 20 feet from the parking lot.
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Mountain Project's determination of some of the classic, most popular, highest rated routes for Boat Ramp Boulder (Roadside Attraction?):
Unknown V3 Boulder, 10 feet
Featured Route For Boat Ramp Boulder (Roadside Attraction?)
Unknown V3 IA : Palisades Kepler State Park : Boat Ramp Boulder (Roadside...
Sit start with hands matched on the ledge under the bulge. Bump left hand up a couple of times, then pull through the crux - getting the right hand up into a pocket. Work your feet up high and find some pretty good jugs for a gentle top out....[more] Browse More Classics in IA