Good question FCTS. It's really only on the Cow do you see the 8-10' Leaders on a regular, daily basis, used by many folks in a given area. So much so, that this technique has become a "standard" for this river.

Maybe in Washington State, we should call it "cowing", and not flossing/lining.

Oh sure, I've seen lining/flossing/snagging on all our WA rivers, but not like the cowing crowd on the Cow.

I'd say the Cow is the only one I know of.