Water’s changing

[Phil Lilley]

https://www.swl-wc.usace.army.mil/pages/data/tabular/htm/trdo.htm
 

starting to see some changes in the water quality fairly quickly. Also we’re seeing some turbidity. Hoping we’re not going to have a bad fall season. 

[Tom C]

At what point do they have to start injecting oxygen?

[Phil Lilley]

They are required to keep it above 4 ppm.  I'd say 3-4 weeks from now.  Maybe sooner?

[Phil Lilley]

Here's the video that shows a automation of the draw down of Table Rock.

 

So with the big rains this spring we see lake levels close to flood stage - 929 feet.  That means there's more warm water in the lake than normal.  The cold water forms in the winter, and when it runs out (summer generation), the spring warm water starts flowing through the dam.  Warmer and less oxygen.  So in years like this, we might  see real poor water quality in October and November.  Hopefully not.

[snagged in outlet 3]

13 hours ago, Phil Lilley said:

Here's the video that shows a automation of the draw down of Table Rock.

 

So with the big rains this spring we see lake levels close to flood stage - 929 feet.  That means there's more warm water in the lake than normal.  The cold water forms in the winter, and when it runs out (summer generation), the spring warm water starts flowing through the dam.  Warmer and less oxygen.  So in years like this, we might  see real poor water quality in October and November.  Hopefully not.

That is really cool.  What depth do the generators pull from?

[Quillback]

That is interesting.  Any idea of when they'll stop pulling water out of TR at the rate they are now?  917?  It's coming down at about 2 feet per week.  

[Phil Lilley]

7 hours ago, snagged in outlet 3 said:

That is really cool.  What depth do the generators pull from?

130 feet deep

[Phil Lilley]

7 hours ago, Quillback said:

That is interesting.  Any idea of when they'll stop pulling water out of TR at the rate they are now?  917?  It's coming down at about 2 feet per week.  

I hope soon.  Save some of this cold water for later.

[Tom C]

On 7/5/2025 at 5:23 PM, Phil Lilley said:

Here's the video that shows a automation of the draw down of Table Rock.

 

So with the big rains this spring we see lake levels close to flood stage - 929 feet.  That means there's more warm water in the lake than normal.  The cold water forms in the winter, and when it runs out (summer generation), the spring warm water starts flowing through the dam.  Warmer and less oxygen.  So in years like this, we might  see real poor water quality in October and November.  Hopefully not.

Here's the DO chart from today.  Did they start injecting oxygen?

They have been running  4 units continuously and seeing a spike in DO makes me think they are injecting oxygen.  

[Haris122]

Are they still running 4 units? Seemed like when I checked it was down to 3’ish the next few days, if I understand how to do the math. Either way probably not low enough for wading like I hoped.