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Bill:
You wrote: "If the Mississippi and Ohio River levels get up the COE will
direct a lot of
the flow from the upper Tennessee valley water shed that would normally up
down the Tennessee R to the Ohio R and then into the Miss R, down the
Tenn-Tom instead. They can do that by holding the water at Pickwick L&D and
opening the spillways in the dams down the Tenn-Tom."
This is a common misconception because it sounds reasonable. But it isn't
true.
The only water released through Whitten Lock & Dam, the uppermost dam at the
northern end of the Tenn-Tom, is the amount of water needed to operate the
lock. Whitten Dam has no spillways nor electric generating capacity. Indeed,
this lack of flow is the reason the water is so clear in Bay Springs Lake, the
water behind Whitten Dam that backs up all the way to Pickwick Lake on the
Tennessee.
You are correct, however, in stating that the Black Warrior River that
empties into the Tenn-Tom just above Demopolis is the major contributor to high
water on the Waterway. So while rainfall in the Tennessee and Ohio river basins
has no affect on conditions on the Tenn-Tom, rainfall from north central to
western Alabama and on into eastern Mississippi definitely does.
Fred Myers
CruiseGuide Author & Publisher
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