It looks like a Spotted Redshank to me.
I think Wilson's Phalarope would sit higher in the water. Also, I think the head pattern is wrong (lores too dark, supercilium too prominent) and I think I can see a hint of red at the base of the bill. I don't see any problem with the rest of the plumage being Spotted Redshank (winter plumage birds can look fairly pale), the structure looks just right, and it is not at all unusual to see this species swimming.
Of course, this one photo isn't great, and more photos may help to clinch the ID for sure.
