Could also be an Oarfish too. Those are native to the Pacific and pretty common off the CA and OR coast ('common', as in seen before, but not seen every day). Maybe a bird of prey picked one up when it was just a juvenile and dropped it in the lake by accident. They actually show an Oarfish in their animation early in the video.
When Oarfish get old they lurk just below the surface (usually shortly before they croak). They're also slow swimmers in general which is consistent with the description.
But the picture they show in the thumnail is way bigger than any fish, shark or whale. Just look at it in comparison to the size of the trees. That may just have been clickbait though, because I don't see that same picture in the video.
When Oarfish get old they lurk just below the surface (usually shortly before they croak). They're also slow swimmers in general which is consistent with the description.
But the picture they show in the thumnail is way bigger than any fish, shark or whale. Just look at it in comparison to the size of the trees. That may just have been clickbait though, because I don't see that same picture in the video.