French Creek!!!
With that said, it's been pretty high and muddy most of the year. Who knows what it'll look like next Thursday. It can be great for smallmouths but it also has walleye, pike, muskies, some largemouths in areas, etc. Woodcock Lake/Creek is an option. I don't have a lot of experience fishing the lake, but the creek can be ok at times. It gets a TON of pressure though so the fish aren't always easy. Panfish, little bass and walleye, sometimes bowfin, and it has muskies.
The Geneva Swamp is the bowfin capital of PA. It can be very hit or miss on the fly though. The crappie fishing can be great, but they too are very hit or miss.
Lake Wilhelm can be alright for panfish and bass.
Sugar Lake is an option for panfish and bass as well(I've even seen chain pickerel there), but shore access is limited if you don't have a boat.
If you don't mind straying west you got the Shenango, but if you go the same distance east of 79 you got some trout options and of course the Allegheny.
Not sure if you're fishing on the way to/from Pittsburgh, but there's also Neshannock and Slippery Rock for bass(and bonus trout). Lake Arthur too for bass and panfish.
Edit: markp posted while I was typing. Yeah, what he said....