Wilhelm isn't dead, at least not yet, Captain. But, like many other PA. lakes, Wilhelm, suffers from a severe desease known as B-I-O-L-O-G-I-S-T.
This is the same desease that is destroying hunting in PA.
Fortunately, the fish commission replaced their director and the game commission just got rid of Carl Roe. Speaking of Roe every PA. hunter should be following this story as it's turning out to be one of the biggest scams (2nd to the kill off of deer) involving hunting. Last I read there may be as many as three of the commissioners being investigated concerning Roe's $220,000.00 buy out.
Sorry, back to fishing. Pymatuning was a concern regarding the walleyes a few years ago. The numbers and size droped dramatically but, that has since turned around. Wilhelm will too (I hope :-[).).
Happy fishing and rememember if you give a man a fish he will eat for a day; if you teach a man to fish he will eat everyday.