[Tweeters] Request for ID help with "odd-appearing" duck

[JUDITH R TAYLOR via Tweeters]

 Friday (19th Dec) at the James T. Slaven Conservation Area (Spokane
County) I spotted an odd looking duck being trailed by a male Mallard.  The
odd one doesn't look like a Mallard, especially the bill - at least, not to
me. However, it was quite a distance away - on the far side of the main
pond as viewed from the Redwing Trail - so the photos I took are not great,
but I hope someone might be able to help me identify this oddity.  Is it a
partially leucistic Gadwall or something else?

The face (especially in one of the photos) reminds me of Long-tailed Duck,
a species that would be out of place in this location.  However, they do
show up inland now and then.

I listed it as "duck sp." on ebird and included several photos.  Here is
the checklist url:  https://ebird.org/checklist/S289246687

If anyone can help me make a positive ID, I will change the listing.

Judy Rowe Taylor
Spokane, WA
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