I did a river Cleanup with Willamette Riverkeeper last fall on this area, and I can assure you that the boater's statement  "You notice there's no garbage on this beach, like every other beach has. We pick up the garbage whenever we see it." is TOTAL CRAP - we pulled out 3 Motorboat loads of trash, and did not even try to tackle the dozen of shore based homeless camps (most abandoned) due to the presence of needles, condoms and worse - the area has been TRASHED...we did pull 200lbs of wire casings out of one spot, where tweakers take stolen copper wire and strip it down to sell.
    I applaud Drone Man for using his "toy" to do what law reinforcement can't or won't - expose this stuff to the light of day. Maybe something can get done to prevent the environmental degradation we see along Rivers and Streams created by people like this. He says "I got a  a sink, a shower. I have a bathroom. That's a home." Where do you think it goes, DUH! Right in the river no doubt