I’m very familiar with the river and the algae that Otter17 is talking about. It’s not like the stuff that floats in the back end of still water ponds or the slimy stuff that is often bright green. The filamentous algae is long stringy stuff that attaches to and covers the bottom of the river. It often breaks off and flows with the current in all of the water column. If you are wading in it, it will quickly wrap around your legs. Out of the water, it’s like heavy wool. If your lure hits the bottom, it gets covered. If you keep the lure off the bottom or even on top, the line catches the algae and while you reel in, your line slides through until lure gets covered. When it is flourishing, the river is all but unfishable. You might find only a few days out of the year when high water might flush the stuff out, but it will be back shortly. I’m sure that suburban development with manicured, fertilized lawns and the runoff into the river is a major contributor to the algae growth. It does seem that certain sections of the river (my favorite sections) have it worse than others. The northern sections of the river and the East and West branches that feed into it had much less than the lower stretches.