Ilgenstein Rock is a long ridge with good views that extends from Bear Swamp Lake to the North Cape on Pierson Ridge. The actual summit of Ilgenstein Rock is just North of the viewpoint along the Hoeferlin Memorial Trail.
The photograph above was taken from the North shore of Bear Swamp Lake.
From Mount Defiance I followed a combination of trails down from the mountain and up to the ridge Ilgenstein Rock lies on. Ultimately followed the yellow trail to get to the true summit and then continued past to the viewpoint.