Eagles in many places seem to feed at city dumps versus salmon streams.
Eagles on the US east coast are doing fine with no salmon and not exactly pristine streams. If the people who believe there is no population problem, if eagles over near me are having a problem maybe the over building and over fishing just might be an issue. If anyone cares.
Also, if eagles in the Vancouver area are having problems.... they must be a little picky about something if they can multiply and survive the east coast of the US.