8/10/2014 - after going to the falls at Fairmont on the Park I went on to the falls at Rivermist subdivision. Had more time to check around and found you get a better and easier view of the falls from the other side. Hike upstream and cross on the bridge, then work your way downstream to a nice, big rock shelf that goes out into the creek.
I took a picture of the sign at the trail head, but I can't tell if it's saying the falls is "Red Fox Falls" or if it's just saying this is the "Red Fox Trail to the falls" You decide! The sign that said it was for homowners only was not there this time.
1/22/2011 - went to Rivermist Subdivision, near Snellville, to find the waterfall mentioned on their website (http://www.rivermistrafter.org/home.html). There is a sign at the beginning of the short trail that says it's for homeowners only, so I suggest contacting them to get directions and permission to see the falls. The creek drops over a long shelf of rock, but only at one end of it, so I've included a close-up of the falls and then a wider view showing the whole shelf.
According to GMAPS this falls is on Watson Creek
Directions and Information: from Snellville, GA
south on Us78/GA10
right on Hewatt Rd SW
left on Rivermist Dr SW
right on Red Fox Run SW
park in turn-around at end of road
trail begins beside sign
Note: the best view of the falls is on the other side from where the gravel trail ends. Go upstream, cross the bridge, then work you way back downstream to the rock shelf below the falls.