The water treatment facility in Westport off Marks Road is a good place to check Lake Champlain in fall and winter. It is there that Hotsington Brook exits into the lake and a small sandy spit is good for wintering gulls which can congregate there. There is also usually a mixed species group of ducks off shore, and the lake can also be good for wintering horned grebes and common loons.
The area around the treatment facility is also good for Carolina wren and variety of woodland birds. Listen too for the calls of bohemian waxwings in winter which may be feeding on fruit trees nearby, and keep an eye to the sky for bald eagles throughout the year, but particularly in the winter.