Kentucky Lakes
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I have found the best site for temperature of Kentucky Lake is the Hancock Biological Station site, where they give both surface and bottom temp.
Hancock Biological Station - Kentucky Lake Water Quality Monitoring
I find it interesting that the site you posted and the Kentucky Lake dot COM site vary by more than a foot.
Kentucky Lake Levels, Conditions and Water Temperatures & Lake Barkley Lake Levels, Conditions and Water Temperatures
I like the site you posted because it shows many more lakes than Kentucky Lake.
I use this one : Louisville District Daily Lake Report since it has most of the lakes that I normally fish. Otherwise, I look up a website (marina or guide service) for the remaining lakes that I only fish occasionally, as they usually have the current conditions/levels listed.
I also have the KDFWR Daily Lake Report phone numbers that I can call & get lake levels & surface temps.
NOTE : all temps are taken at the dams of these lakes, unless otherwise stated. Surface & water column temps will vary at other points on the lakes.
... cp :kewl
Another good site that I put on phone iPad etc Tva lake info U can download app Tells discharge rates current levels by the hour etc foe the lakes that they manage Including ky, Barkley etc I check discharge rates while on water white bass fishing in summer alot
I like this one. It is more "real time" and has many lakes and streams.
water.weather.gov/ahps2/index.php?wfo=LMK
For KY specifically straight from the TVA:
https://www.tva.gov/Environment/Lake-Levels/Kentucky
For KY and Barkley (also nice if you fish the tailraces):
Kentucky Lake Levels, Conditions and Water Temperatures & Lake Barkley Lake Levels, Conditions and Water Temperatures