Yocum Falls is composed by a series of consecutive cascades. The upper tier and its lower drop, that spreads 25-35 feet over a ledge along Camp Creek are accessible, whereas the middle section is crowded by matured timber and difficult to access. The surrounding hills of Tom Dick and Harry Mountain are of Pleistocene or Pliocene origin with andesite originating from moderately porphyritic pyroxene lava flows. Further towards Mirror Lake the andesite is basaltic from lava flows of the north side of the Tom Dick and Harry Mountain.