I know this is an old thread, but I was in Picher a couple years ago and almost everything was torn down since I had been there before that. If you already live in Oklahoma it might be worth a trip (I kinda doubt it tho, depends on where in Oklahoma you are). However, there are other things nearby that might be more interesting. If I were you I would research a town called Vinita (can’t remember how to spell it) OK, not too far from Picher and it had some gems when I was there last.
*The EPA, however, did recently include the town that neighbors pitcher on the north side of the state border on the superfund list, so there might be some newer items on that side of the OK border. That’s just a guess though. I think the town is called Treece? Something like that.*