White head, bright bright sunlight = highlight problems, I'm afraid, but these are at least recognizable.
I presume they're stuffing themselves on zebra mussels before heading back to the summer ocean habitat; I would normally have expected all the longtails to be gone by the end of the second week in April, but there's quite a large flock there still.
The first three pictures are from the offshore/upwind side, and there were metre-fifty waves coming in, which tended to obscure the ducks as they vanished into troughs. The last two pictures are from the the inshore side, which was calm, but the ducks were mostly too far out for a useful picture with this lens. (800mm Rokinon; I clearly need a longer lens. :)