I know from my own personal history with the Susquehanna, that it was a very polluted river in the 60's. All town's dumped their raw sewage into the river. I remember fishing over at the sh#t plant on the West Side of Steelton and seeing turds floating out to thr river. And the Susquehanna has always had episodes of low water. I remember walking across the Susquehanna down at the East End of Steelton. All we used to catch were catfish and carp and occassionally someone would catch a smallmouth. I was under the impression that the Susquehanna has been cleaned up since the days of my youth. I was a Steelton river rat growing up so I know that river as well as anybody , at least in Steelton.