The claim: Federal prison camp located south of Williamsport on the Susquehanna River. It has a current inmate population of 300, and is identified by William Pabst as having a capacity in excess of 15,000 on 400 acres.
What it really is: There's actually three Federal prisons there, not one.
The first is a low security prison that can hold 1,450 inmates, a medium security prison that can hold 1,400 inmates, and a high security prison that can hold 1,000 inmates. That's a total of 3,850 inmates, which is almost four times less than what is claimed the prisons can hold.
Also, William Pabst has been making claims about this sort of stuff since the 1970's, and he has been described by some people as being unhinged, so any information from him should be considered unreliable.