Physical FactsSurface Area: 31,700 mi2(82,100 km2): The size of the state of MaineVolume: Roughly 3-quadrillion gallons (2900 mi3 (12,100 km3)): Enough to cover North and South America in one foot of waterAverage Depth: 483 ft (147 m): About the distance between Lake Superior and Duluth's hilltopMaximum Depth: 1,332 ft (406 m): The same as one lap around a standard track