On Tue, 12 Apr 2005 13:47:57 -0400, "Mudfish\(Co30\)"
wrote:

A wing dam on the Mississippi is a
submerged or semi submerged rock
structure put in place to direct the river
currents to the main channel.

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I assume they are charted?

The builder probably didn't get much previous chance to fine tune his
navigation skills (or learn his limitations).