Susquehanna endangered

I've been feeling very nostalic about the Susquehanna, then I run across a report naming it as this year's #1 Endangered River by the conservation group, American Rivers.

Now that I think of it, I remember Monday mornings on the shore at Shady Nook, when masses of bubble scum came floating down the river in mid-morning. Grandma used to say it was the soap bubbles from everyone in Sunbury doing their Monday morning wash. I wonder if people in all the other little towns along the lower Susquehanna also did their laundry on Monday morning, spewing more and more foamy wash water into the stream until huge bubble islands eventually floated into the Chesapeake every Monday evening?