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At 11:09 AM 11/21/05 +0000, you wrote:
>To be honest, this isn't really a question about navigation, but about
>geography and hydraulics. But some Nav-l contributors hail from the Illinois
>area, so perhaps know the answer.

Others can probably address the Chicago area drainage better than I but a
few words about other mid-western US and Canadian drainage patterns.
Here in Wisconsin, almost all of the area drains to the Mississippi; bit of
the Eastern margins of the State drain to Lake Michigan and a fair amount of
East central Wisconsin goes down the Fox River to Lake Michigan.  Only a
very small margin of Northern Wisconsin drains to Lake Superior.  The Red
River which forms the boundary between Minnesota and North Dakota is
interesting. it drains the eastern portion of North Dakota and the western
third of Minnesota but the water goes North to James Bay.  Makes for
interesting times in Fargo ND when there is a big snow melt and spring
rains before the Northern parts of the Red River thaw out.  In general, I
think it's fair to say that Lakes Superior, Huron, and Michigan have very
small drainage basin compared to their size.  The State of Michigan located
between Lake Michigan and Huron is probably the biggest contributor to
Great Lakes drainage.

   

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