Mergansers (Mergus merganser) are not common visitors to Cheney Lake, but a flock of about a dozen showed up in early November.
I rarely see trumpeter swans on the lake, and I don't ever remember seeing them so early.
Swans have arrived early in Southeast Alaska this year, with most lakes still frozen and no green grass anywhere. Most lakes are frozen; the swan is sticking to a small patch of water surrounded by ice.
4/16/15 Early waterfowl - Anchorage, Alaska, USA