Cannot identify.
Not a Canadian goose, but around Goose sized.
Must be passing through, I don't recall ever seeing anything like it.
I saw the head dip underwater, but it was not a proper 'ass up', never saw it dive.
Almost look like a Loon (which would never show their face around here) but the back was dark black. It spread its wings , while greeting another of its kind , and I could see the underside. Belly was snow white. All white bib.
Never heard a sound.
Black head, slender neck, long large bill.
Not a Cormorant , and the neck was too long for a Mergasner.
I wish I were closer.
When I started composing this post I was clueless, although now I am starting to suspect it was a Western Grebe.