I just got back from Soap Lake where I saw two immature plovers (BB and Golden). I am thinking American on the Golden. I have some photos (digiscoped with my phone) that I can post to ebird later, but overall it didn't seem lanky enough to be a Pacific, and the primaries extend noticeably past the tail tip. This one's a county lifer for me. Something that I've recently discovered is that it's ideal to visit Soap Lake in the fall after a windy night. That seems to bring in the good stuff.

Matt