Not a bad bet, I suspect it's a hybrid Glaucous-winged x Herring. There's some greyish tones in those wing tips plus that hefty look of a Glaucous-wing. A smudgyish neck and head shows some Glaucous-wing influence over more streaky that is more Herring to me. Tough ones these guys are. And it's not getting any better! They are continuing to interbreed and the hybrids are also.
Gord Fraser Valley Birding Administrator eBird Regional Editor (Fraser Valley)