I had to get my bird field guides out to identify but from the photo I figured they were Common Mergansers (Mergus merganser). I sketched from my field guide so I will remember next time I see them. They are migrating through to their breeding grounds in Alaska and Canada.
As I drove up the driveway, I saw the familiar flock of robins and cedar waxwings which hang out all winter here.
They moved up the driveway to another damp area.