I've read over the years that spills directly correlate with increased returns (statistically) and it's a big step in the right direction
The Chelan system is a real victory in designing a more effective passage for smolts and also an example of our willingness to do the right thing where dams have screwed up the runs.
To dream even more, there are European communities who have built artificial stream by-passes that provide excellent whitewater and angling sport opportunities. River branches in effect.
It's clear to see that barging is rooted in special interests and politically motivated. I hope we as a people can move strongly toward what's actually best for the fish rather than their own political or commercial interests, for the sake of the salmonids!