Seems obvious that the plug got pulled...
Water Levels in 3 Great Lakes Dip Far Below Normal - New York Times
Although the drop in levels in all three lakes is variously ascribed to climate change or new rainfall patterns, evidence is growing that people caused some losses in Lakes Huron and Michigan.
Gravel mining early in the 20th century by private companies and dredging by the Army Corps of Engineers, particularly in the mid-1960s, may have widened and deepened the St. Clair River, through which those two lakes drain into Lake Erie.
The flow may be eroding the riverbed. The erosion may in turn result in increased outflow, more than can be replenished by rain or snowmelt, according to a study by a group of Canadian coastal engineers.
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