According to this article, (if someone already posted it my bad) The Salmon are back in force. And guess what Dredging or not dredging had doodlee squat to do with it all along.
As I pointed out before the main culprit are the ocean temperatures and over fishing.
This is over a moth old but I was in the woods.
http://www.sacbee.com/2012/07/16/4633049/qa-smashing-salmon-season-expected.html