Mason Branch is located on the Northern shore of Gauley River in the Gauley River NRA. It's accessed by way of CR 22 which leads to river level via a river access road. Bear left at the intersection "V" in the road for Meadow Branch. It goes downhill along another unnamed creek.
From US 19, near the town of Mt. Nebo, turn west on SR 129. Drive for 8.5 miles and turn left on Backus Bridge/Panther Mountain Rd. CR 11/1. Follow Panther Mountain Rd. for 2.6 miles and make a hard left on Griffin Rd which turns into Tipton Rd (CR 22). Follow for 1.6 miles to a fork in the road just after you pass the Arnet Chapel. On the way down you will find a creek on your right. There are some nice falls in there.
There is a nice fall at the bottom and some pretty nice ones up top as well. It's not that long of a run, and it's pretty. You can creek walk most of it.
There is a nice road side fall on your left on the way down as well which is not very obvious. You'll come across a space on the left side of the road that's just wide enough to pull completely off the road. Just there, in behind the trees is this waterfall.
Continue down to river level and drive east through the various open areas until you get to an open area in the trees where you can see the road goes up into the woods and continues upriver. Park at an old collapsed shelter. The falls are back in the woods a very short walk. You should be able to hear them.
There are two falls here, so make sure you go upstream a bit for the second. It's a grotto falls at Mason Branch. Very pretty.