Thanks for the simplicity of the link and the great photos, Mike.
Your bird is a Bonaparte's Gull, however. I can see how the darkish carpel bar and remnants of juvenal plumage could throw you. This is a confusing plumage.
The clincher for ID is the flight shot. Look at the black line that extends along the trailing edge of the wing. That neat black line is absent in juvenal through first basic (formative) Little Gull, which shows black tips on the outer primaries only and has a white trailing edge inboard of that. There are several other differences I can see in the bird at rest, and we could go over those offline.
Louis Bevier
Fairfield
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