"There are usually very small numbers of them, three or four, but this winter there are fifty. Their population in Rockport is up, too, so this could bode well for the extremely endangered harlequins".
Species Range, Histrionicus histrionicus (cool name for a beautiful Anatidae)
http://content.ornith.cornell.edu/UEWeb ... ap_new.gif
Unfortunately, it's more likely that the birds got pushed south by the exceptional winter weather.
Most of our migrant Canadian geese and duck populations got pushed far to the south of us, too (PNW) last year and this year - same reason, unusually harsh winter weather (exceptional precip and temperatures).
Interestingly, recent cold winters in NA appear to correspond to synched cold phase NAO, PDO and ENSO - and to an unusually quiet sunspot period during a surprisingly lengthy solar cycle interphase.
Large-scale Audubon survey conducted recently in Canada suggests that many Eastern species are in serious decline, arising from land-use change.
However, this species has experienced a mild recovery in breeding pair numbers in the last few decades, so maybe you are right (fingers crossed).