Under large overhang on the west side of Castle Rock. There are several options: the left side of the overhang is supposedly A2+ or the right side of the overhang which is C1. Good pro, crack gets skinnier as you go tword the lip. The right crack goes free at 5.14b/c.
Solo ascent, using a silent partner, Had one piece blow, but was transferring to another good piece so I didn't fall. It's all pin scarred, I didn't have much gear for such a thin crack so was left getting creative with Nuts and my one small cam. Great Clean Aid, will definitely do it again to get better at clean aid.