15-foot Square Rock Falls is the middle of three small waterfalls along a small tributary flowing into Pumping Station Lake near Filmy Fern Falls. The waterfall can be heard while walking the gated Pumping Station Road to Filmy Fern Falls. It can be accessed via a steep scramble down the slope. 

For detailed directions, see page 253 in Mark Ozboyd's "Waterfalls of Georgia" guidebook.