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    Re: Illinois drainage (Michigan drainage)
    From: Frank Reed CT
    Date: 2005 Nov 22, 21:32 EST

    Bob Batten wrote:
    "The St Clair River empties  into Lake St Clair which is a shallow basin
    averaging 15 feet or so deep and  about 25 statute miles in diameter.  This is the
    major recreational boating  area for the greater Detroit region.  The Eastern
    side of the lake is much  shallower, with marshes that provide good fishing.
    A shipping channel of  about 30 feet deep was dredged across the lake. The
    flow out of Lake St Clair is  to the South, forming the Detroit River."
    For anyone interested in the  bathymetry of the great lakes, there are
    wonderful data files and derived  imagery available on the USGS Great Lakes  site:
    You can  follow the details that Bob wrote about above in very nice detail.
    It's easy to  see why erosion would not deepen the channel through Lake St.
    Clair, though it  might at the choke points at either end.
    An interesting feature in Lake  Michigan is an ancient meandering river
    channel deep underwater up near the  connection with Lake Huron.
    42.0N 87.7W, or 41.4N  72.1W.

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