Byline: Dan Egan

Sep. 17--People are worried Lake Michigan water levels are lower than normal, but most have no grasp of what "normal" is for the world's fifth largest freshwater lake. When you chart the lake's levels over the past century, the picture you get looks something like a cardiogram -- almost rhythmic pulses of highs and lows. It is never a flat line for a lake where levels can swing by about 6 feet in just a matter of years. That means the lake is rarely at its "normal" level; it's either on the way above it, or on the way below it. At the moment, ...

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