Mason Branch is located on the Northern shore of Gauley River in the Gauley River NRA.  It is accessed by way of CR 22 which will take you down to river level via a river access road.  Bear left at the intersection "V" in the road for Meadow Branch.  It goes downhill along the creek.  Park and hike to the creek's confluence with the Gauley and creekwalk up.  It's not too hard but there is some climbing.  It will put you back out on the road if you go all the way up.