Mount Prater, Hidden Couloir. In late September 1980, Del Johns and I approached the unclimbed east face of Mount Prater (13,329 feet) by way of Tinemaha Creek. At first it appeared the route would be all rock; however, part way up the face a deep north-facing, ice- filled couloir appeared. The rock of the east face above quickly was forgotten, and about 800 feet of typical 45° Palisade ice climbing led to the summit ridge, south of the peak. We descended by an easy gully north of the summit. F4 to F5.
Wayne N. Sawka, U.S.G.S.