i fished the Yough for years over summer vacations in the 90's and early to mid 2000's . it was the most consistent producing river for me back then and is still a good fish from what i hear.
you can wade fish all the way up stream to and past the discharge tube . dont be scared, they time and schedule the discharges and there is a siren that would wake the dead when they do discharge. the fishing is very good there but they also get a lot of pressure because its so close to Deep creek so be aware the fish aren't dumb.
if you go down stream past the big island in the middle of the river it really flattens out and becomes sandy and deep, not the best wading. from memory further south than that is boat float only. very deep and rapid laden. there are guides in the area that float it. my dad claims we did it one time and were productive on small mouth bass but i cant for the life of me remember floating that river.
i love the yough.
The Single best day ive ever had in the region was on the Castleman. Foam hoppers in August and my dad and i landed more fish than we can count. so if you can, check that out.
Ive also had great days on the north branch of the Potomac but thats a drive from Deep creek, probably 1 hour one way and i would NOT recommend fishing it alone ever. that river is NO joke.
Enjoy! i would love to take a day trip back out the garret county area for some trout fishing. its the best trout fishing in Maryland in my experience and really the only place i will go out for Trout.
tight lines.