Thursday, March 3, 2022

1969 28mw J. Percy Priest Dam on Stone River in Nashville, TN

(Satellite)

"J. Percy Priest was a high school teacher, coach, and reporter and editor for The Tennessean before representing Nashville and Davidson County in Congress from 1940 until his death in 1956." [Tennessean, paycount, has a gallery of 44 photos of President Lyndon B. Johnson at the dam's dedication]

Street View

Street View, Apr 2021
[Early April was a flood event. "Nashville received a total of 7.01 inches of rainfall March 27-28, 2021, making it the second highest two-day total since precipitation records were kept in 1871. The water level on the Cumberland River in Music City reached 40.55 feet, exceeding flood stage by 0.55 feet. " [TVA-$1.8b]]

USACE
"Rising 130 feet above the streambed, the combination earth and concrete-gravity dam is 2,716 feet long with a hydroelectric power generating plant."
1 turbine of 28mw
The gates are 42' tall. (504.5-463.5)
Normal pool is 490' and permanent pool is 480'.

The caption is more interesting than the video. It is interesting that they provide the annual energy output, but not the generating capacity. Normally, it is the other way around.
Screenshot @ 0:00 via Wilson Lock
J. Percy Priest Lake is a central location many fishermen enjoy visiting year-round.
Conveniently located 10 miles east of Downtown Nashville, JPP provides fishermen with easy access to fish during TWRA coordinated trout releases which happen throughout the year.
JPP Dam houses one hydroelectric generator that produces an average annual energy output of 70 million kilowatt-hours and has contributed significantly to reducing the frequency and severity of flooding on the Cumberland Valley.

Since the gates were in the shadows in the above photos, I was wondering if the dam used sluice or Tainter gates. This photo clearly shows that they are Tainter gates.
AJ photo, Jul 9, 2013, via FourSquare

I don't know why there is a stream of water coming out of the powerhouse in the above photo, but the photo below shows that stream flowing even when all of the gates are closed. This should not be the turbine's output. The output of turbines comes out under the lower water level.
stvatandem via TrailLink

But that stream is not always flowing.
Is the purpose of the "side stream" to aerate the water?
WKRN
[During the Summer of 2019 the road across the top was intermittently closed for inspection and routine maintenance of the gates and their machinery.]

USACE-50th

USACE-50th, this page has several more construction photos if you click the "J. Percy Priest Construction Photos" plus sign.


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