The CA fish don't go as far north as WA. Like others have pointed out, they avoid BC and AK (and all the PP folks who go there). Somewhat different ocean conditions down there, too. May have different ocean sources of food, they don't compete with chum and pink (known to depress Chinook and coho in the north) and they don't have a whole lot of coho.

The real cynical could say they don't have our folks managing their fish, either.