At an elevation of 7733 feet above sea level, Yellowstone Lake is the largest high altitude, mountain lake in the United States. The lake is about 20 miles long and 14 miles wide, but it is such a funny shape that it has a thumb and two arms. The lake supports six fish species: cutthroat trout, longnose dace, lake chub, lake trout, long nose suckers and redside shiners. - AsNotedIn