Jim,

I'm from SW PA (Somerset County) and now live in Waynesville, OH (just north of you). Lots of good FF in that area. Here are a few I've fished and recommend:
Loyahanna Creek, Indian Creek, Laurel Hill Creek, Youghiogheny River, Meadow Run, Wills Creek, Ben's Creek, Castleman River, Four Mile Run, White's Creek, and the list could go on and on. You've already seen the PA Fish Commision Site so that's a good starting point. All the creek and rivers listed above are in the Somerset, Westmorland, and Fayette County areas. Many, many other I've not fished. Feel free to send me a PM and we can talk more on this if you'd like.