A lot of analysis is going into a puzzling cell phone video.
I think that the evidence is very poor for a large unknown beast living in a viable population in this lake, although this does not totally rule out an occasional visitor of some kind wandering upriver to the lake. This video? It looks funny - not as in faked, but as in puzzling. It’s not an easy ID to make. It seems too big for an otter or beaver. I’m not sure we can rule out “swimming deer plus wake effects,” but it’s not an obvious deer/moose either.