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Old 05-22-18, 04:54 PM   #1
Bboyd
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Default JB on May 24

Planning on hitting Jones Bridge on May 24, Thursday. If anyone wants to join me you are welcome.
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Old 05-23-18, 11:16 AM   #2
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In planning to fish tomorrow, I checked the release, yesterday and today which is from @ 3 to 8 pm, and given the table reading of @ 14 hrs for JB to be fishable after the release, I expected that @ 10 AM this morning, the flow would be down to @ 1200 cfs and gage height at 3 ft. Just now I checked USGS site 02335000, I assume that's Jones Bridge, and find the flow at 3000 cfs and rising and the gage height at 5 ft and rising. Obviously not conditions conducive to safe wading. Are my calculations off?
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Old 05-23-18, 12:25 PM   #3
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BBoyd, they put Suwanee under a flood warning this morning so I would be willing to bet that the river will be blown out and muddy tomorrow. You may want to set your sights farther northward. Far as your calculations go, this is how I do it. Referencing your example for JB... release is from 3-8pm. It takes 6.5hrs to get to JB then has a 5hr highwater/crest window. After the crest window closes then the 14hr count to full fallout begins. On a timeline it would be this:
Release 3-8pm
Distance to JB 6.5hrs +5hrs at highwater/crest window
Falling window starts at highwater crest

Water first reaches JB around 10-1030PM, stays high for 5hrs, THEN begins to fallout for the next 14hrs. I hope that makes sense.
Currently the turbidity gauge at JB is at 150 and climbing...
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Old 05-23-18, 01:35 PM   #4
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The website says no release today, but Im not in a position to call the number

The lake is .9 feet over full
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Old 05-23-18, 01:41 PM   #5
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My bet is that JB will be unsafe to wade tomorrow. Even if it's safe, it'll be so muddy that the fishing will poor. I'd recommend checking out areas much further upstream and be safe.
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Old 05-23-18, 02:25 PM   #6
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Thanks all. Guess I'll be doing something else tomorrow.
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Old 05-23-18, 02:52 PM   #7
browniez
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Quote:
Originally Posted by Philhutch80 View Post
BBoyd, they put Suwanee under a flood warning this morning so I would be willing to bet that the river will be blown out and muddy tomorrow. You may want to set your sights farther northward. Far as your calculations go, this is how I do it. Referencing your example for JB... release is from 3-8pm. It takes 6.5hrs to get to JB then has a 5hr highwater/crest window. After the crest window closes then the 14hr count to full fallout begins. On a timeline it would be this:
Release 3-8pm
Distance to JB 6.5hrs +5hrs at highwater/crest window
Falling window starts at highwater crest

Water first reaches JB around 10-1030PM, stays high for 5hrs, THEN begins to fallout for the next 14hrs. I hope that makes sense.
Currently the turbidity gauge at JB is at 150 and climbing...
Phil itís 14 hours after they put the plug back in that itís totally fallen, not 14 hours from crest at medlock.

Basic rule it takes it a little more than twice as long to drain from the end of the release, as it does for water to reach that point in the river. About 2:20 for it to hit McGinnis and itíll totally fall 6 hours after they put the plug in. 6 to get to jones and 12 to 14 to fully recede. Gauge was only about 6 inches from dead low at 2:15. Already fallen more than 3 feet, and some of that is runoff holding the flow high right now.
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Old 05-23-18, 03:02 PM   #8
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Quote:
Originally Posted by ChaChung View Post
My bet is that JB will be unsafe to wade tomorrow. Even if it's safe, it'll be so muddy that the fishing will poor. I'd recommend checking out areas much further upstream and be safe.
I just checked because I wanted to fish somewhere in the area as well and the turbidity is currently at 197 at JB, it'll be a few days and some releases to clear that up to fishable conditions most likely. With more rain expected the feeder creeks will be dumping more silt in the next few days as well. The worst I've ever fished was a turbidity around 40 when i got in and that's only in an area I know EXTREMELY well otherwise I wouldn't fish with a turbidity over 15 or so really. Like others have said I'd fish the upper tailwater dam etc next few days if I go out.
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Old 05-23-18, 03:18 PM   #9
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Quote:
Originally Posted by Philhutch80 View Post
B It takes 6.5hrs to get to JB then has a 5hr highwater/crest window. A.
https://waterdata.usgs.gov/ga/nwis/u...ate=2018-05-17

I am providing a link to the chart overlaying the Dam (maroon line) and 141 gauges from 5/17/2018 to aid in the discussion. This demonstrates the amount of time the water takes to get from point A to B.

I have never heard anyone using 6.5 hours for the start of the release to hit JB. On 5/17 6.5 hours would have someone wading in +4,000 CFS or 4.5'.

Maybe we are using different calculations and using the same terms. My rule of thumb, which I have seen played out in the gauges countless times is 4.0-4.5 hours from the start of the release to hit the gauge at GA141/Jones Bridge. JB park is 15 minutes or so south of the gauge. I use the "Table function" of the gauge and determine in which 15 minute period the water starts to increase in flow. Granted there are variables, which have a role in this determination, but this is the point from decreasing or level water to the start of rising water. This is not a measure of safety, but an identification of the inflection point.

Since we all have different views on safe wading, mine are to be off of the water 4.5 to 5 hours from the start of the release.

When will it be safe to return depends on the level of the river prior to the release, trib flow, the size of the release... Generally 14 hours from the end of the release is usually a solid guide.
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Old 05-23-18, 03:28 PM   #10
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Quote:
Originally Posted by WPrich View Post
I just checked because I wanted to fish somewhere in the area as well and the turbidity is currently at 197 at JB, it'll be a few days and some releases to clear that up to fishable conditions most likely. With more rain expected the feeder creeks will be dumping more silt in the next few days as well. The worst I've ever fished was a turbidity around 40 when i got in and that's only in an area I know EXTREMELY well otherwise I wouldn't fish with a turbidity over 15 or so really. Like others have said I'd fish the upper tailwater dam etc next few days if I go out.
No release on Wed or thurs, Suwanee Creek is running 8' and the lake will be +1' over full summer pool. I would bet we will see a solid release during the day on Friday and maybe a split AM/PM. Upper tailwaters will be crowded during the beginning of the holiday weekend.
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