Here is the plan that resulted in the above article:
https://tidalexchange.com/wp-content/uploads/2017/12/PS-CHIN-RMP-FINAL-12012017.pdf
According to the above plan, about 40% of mortalities for the Stilly fish occur in southern BC. Don't think that only curtailing US harvest of these fish is gonna make much difference. The plan indicates this & similar interception issues are currently under negotiations.
FYI most of these endangered Puget Sound runs are not in an urban environment by any means. Farm run-off, logging damage & failed septic systems are bad news as well.
From my interpretation the article posted by Derby & the plan contain "alternative facts", but from the plan implementation details our "bad for sportsfishers" situation in Puget Sound looks to be headed for getting much worse somewhere where the 2 sources agree on.