A short walk from the CCC picnic shelter north of the dam leads to a huge pile of Brassfield dolomite with an exposed rock face behind. In 1984, this was the site of a massive rock fall when 375 tons of overhanging stone tumbled down. The collapse was caused by the erosion of the softer underlying Massey shale, leaving the stone above unsupported. This process repeated itself in 1996 when an additional 100 tons fell, and continues today. Walk up the stone stairs and examine the small caverns created by water traveling through the stone over extended time.