Just found your site a few months ago and I love it!
Back in the 90s I went to a summer camp just outside Varysburg. An evening activity would often be a hike down to the waterfalls on Stony Brook where it runs roughly parallel to route 20A.
Anyways, I have pictures. I'd have to dig them up, but I think the falls are about 10' and are a great place for wading on a hot summer day. I've been looking on the satellite images on Google maps and it's so dense with trees, plus my sense of direction back then was off, so I can't really pin point it. I did a google search for a variety of terms, and found one picture of a camp counselor in summer 2015 at the creek, but not the falls.
I suspect the falls are on private property and we trespassed, but the owner must not mind us camp kids.