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Irene's Arete is one of the south-facing aretes and buttresses below the summit and is not a summit climb. The East Ridge route tops out on the summit of Disappointment Peak. According to the Climber's Guide to the Teton Range it is rated at Grade II, 5.6 "a short, enjoyable climb on excellent rock leading to one of the finest viewpoints in the range, the summit of Disappointment Peak."