Sit start on two low holds on the upriver side of the boulder, up the block to the apex. Knee-bars might come in handy.

Irregular Arete

Regular Route

Thunderslap

I believe this route is technically a harder variation to the Irregular Arete. Start low on the upstream end of the River Boulder on the two jugs on either side of the bulge. Get low and difficult to see feet, or a heel/toe hook around the right edge. Manage your way up the bulge with a couple powerful throws and slaps up the arete feature to your right. 

This problem is an eliminate and does not use the face to the left of the bulge and stays on the bulge itself the entire time. If you use the face then you climbed the original problem, Irregular Arete V1.

One of the first "established" boulder problems in Palisades State Park. Start out by smearing on tiny pinky sized nub on the bottom. With your left hand grab the side crimp to the left. Your right had crimps the right side crimper. Once you get that down pull yourself up all well keeping your body weight on the right leg and balanced. Reach with your right hand up to another small crimper and then bring your left hand up above to a crimper on the left smear and pull up and over. Super Classy and Super Fun!

The River boulder was one of the first "established" boulders in Palisades. It is in a perfect location right by the river on the shaded side. If this boulder was a few feet taller it would be classic anywhere. A great crimp slab problem and a couple of harder SDS on the arete problems exist.

Description

Location

Protection

Routes in The River Boulder aka The Shield