Little Johannesburg, Plumline Buttress. Unnamed on maps, this 7945-foot monolith sits directly across the valley from Easy Pass, just inside the boundary of North Cascade National Park. On August 21 Steve Costie, Chris Martenson, Ken Small and I made the first ascent of the north face. We followed a prominent buttress for 2700 feet from the valley directly to the summit. NCCS II, F4.