Bob is correct. Various Chinook stocks intermingle with one another along the entire West Coast. Generally, the fish off Monterey are CV origin, but they could be from anywhere from CA to AK.
If you're really interested, there should be some CDFW reports that describe the coded wire tag (CWT) results at each major port. CWT's are small tags with unique IDs that are implanted in 25% of the hatchery-origin Chinook in CA and in 100% in the other states and BC. They do this to find out the exact question you are asking about.
“There is a cult of ignorance in the United States, and there has always been. The strain of anti-intellectualism has been a constant thread winding its way through our political and cultural life, nurtured by the false notion that democracy means that 'my ignorance is just as good as your knowledge.”
― Issac Asimov
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