A couple of us spotted what appeared to be an otter, fishing at the mouth of the outlet. The lake was frozen up to the outlet and the outlet was open water. We had walked off the old trolley line at this point to get lake views. Even with binos it was hard to get a clear sighting but the animal was diving in the water and staying under for at least 30 seconds or more. It did seem to have the shape of an otter. Later down at the point where the trolley crossed the outlet there were slide marks in the snow by the water's edge. They looked like otter slides!