Steep route up the black water streak. A few pumpy moves to get going, then ascend the slightly overhanging section up to a bomber pocket-sidepull. Now move through the vertical crux up the thin face to a small ledge.
I did laps on this thing and felt the burn in my arms. Crimpy, pumpy, and thought provoking. Look for a two finger 'pocket' near the top at the crux. Use this pocket to layback using your left hand fingers, put your right toe into a pocket and push up on that foot to a right hand mono digit crimp(intermediate hold), then bump up to a nice crimper(right hand again).
Freaking hard and awesome. Wish I could 'run laps' on it. As immaculate as a dark water streak on Castlerock conglomerate can get. The 'Realization' of Castlewood. Hehe.