I don't know if this is a help or a hindrance, but-- we had three Northern Shovelers on 4/08/17, two males and one female. They were here for several days, and gave us good sightings in the meadow behind the store. Sorry we're not better at official reporting! Fortunately, Lisa Brackett made a note in her bird guide that day, so we were able to look up the date.
Jackie Boegel