I believe these are female 'common mergansers'.
I have been seeing them in the Lamoille River, by the trail in Jeffersonville.
Jo
(http://www.vtgrandpa.com/photos/albums/icestorm_080309/DSCN5507.sized.jpg)
(http://www.vtgrandpa.com/photos/albums/icestorm_080309/DSCN5510.sized.jpg)