Not sure if any have went here....
http://www.fish.state.pa.us/water/lakes/opossum_lk/00opossum.htm
Pretty tiny though.
And I've heard good things about this lake, but I think you guys are west rather than east so it would be a ways away (1.5 away from me)
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Blue+Marsh+Lake,+PA&sll=37.0625,-95.677068&sspn=54.137829,79.013672&ie=UTF8&hq=&hnear=Blue+Marsh+Lake&z=13
And there is this one that I know nothing about at all:)
http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=Long+Pine+Run+Reservoir,+PA&sll=39.926062,-77.44297&sspn=0.103603,0.154324&ie=UTF8&hq=&hnear=Long+Pine+Run+Reservoir&ll=39.939949,-77.433443&spn=0.051791,0.077162&z=14