Thanks to Tina Toth for these amazing photos! This female-type Melanitta scoter was seen in November 2017 at Grey Reef Reservoir.
Note the extensive white in the front of the face, the more gentle slope into the bill, and what appears to be less-extensive feathering on the culmen. In the above photo, the head is slightly turned to the camera, potentially throwing off the head-to-bill shape.
The feathering on the culmen is the strongest piece of evidence I can present on this individual. Though photo quality might be causing the lack-of-feathering effect. Would it be enough to sway a records committee? Meh. Who cares, it's a great bird! (Just to clarify, this is NOT a Stejneger's Scoter.)