I agree it COULD have been a perfectly legal activity and sincerely hope it was, but as Eric mentioned it would not hurt to have it checked out. As far as a possible stocking with fish, there is no stocking as far up the river as I was, and it is usually done in spring to increase smolt survival. Whether it was legal or not, my main concern was if it was an illegal dumping I wanted to get it stopped ASAP. As it turned out, I wasn't able to accomplish a thing.