From a Q&A Army Corps
Q: When does the lake drawdown occur and when is the water level raised again?
A: The J. Percy Priest drawdown typically begins in late September or early October at typical summer pool elevation between 489.5 and 490.5 feet above mean sea level (msl). The drawdown will continue until late November or early December to a winter pool elevation of approximately 483 feet above msl. The lake elevation will remain at winter pool until early March, when the lake elevation is gradually returned to summer pool. Lake elevations can fluctuate during this period because of seasonal rainfalls and other inflows.
As for Old Hickory I only have found info on the River Below (Cheatham Lake) If they do lower Old Hickory it is a very small window as it hardly ever
changes elevation.
Info on Cheatham :
The normal pool elevation of Cheatham Lake is 385 feet above mean sea level (msl). Cheatham is a run-of-the-river navigation project, and there is no scheduled winter drawdown. However, the lake elevation may rise during major rainfall events.
Below the dam, the normal summer pool elevation of Lake Barkley is 359 msl, and winter pool elevation 354 msl. The Lake Barkley pool extends all the way upstream to the lower side of Cheatham Dam.
To hear a recording of lake levels, hydropower generation schedule, water temperature, and general fishing information call (615) 792-2190 or visit the web site.
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