Sentinel Rock, North Face, Flying Buttress Direct. In June Chris Fredricks and I established a new route on the north face of Sentinel Rock. Our route followed a huge chimney system in the center of the Flying Buttress, the 800-foot high buttress attached to the right side of the north face. Moderate climbing, up to F7, along with 50 feet of aid, carried us to the top of the buttress about noon. From here we followed the Headwall Pitch of the Salathé-Steck route for about 50 feet, then curved off to the right to a sling belay. From here to the summit, a distance of around 700 feet, we followed a curving crack system, which was mostly free climbing. The climb took one and one-fourth days, with a bivouac at the base and one at the top. Fifty pitons were placed, plus three bolts. Grade V.