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How much mud does a a tug kick uP

Old 11-15-2020, 07:09 PM
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Default How much mud does a a tug kick uP

I primarily wreck fish for blackfish. They need good solid structure to feed on shellfish. Some of my fishing is done in shipping lanes and over the years I have notices more silt on the wrecks. My question is a bit complex. A huge tug pushing a barge certainly has a lot of horsepower and a big wheel. Is it conceivable that the prop can disturb bottom 70 feet down and maybe stir up silt that can cover the strucrture?'Thanks for the info
Ray
Old 11-15-2020, 07:36 PM
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Not that deep.
Old 11-16-2020, 03:13 AM
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Tides will naturally silt up structures - it’s why dredging is a never ending job.
Old 11-16-2020, 04:21 AM
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How do I word this without being conceived as a dik. How do you know that a wreck in 70 feet of water is silted up? Are you sure it’s not normal accumulation of sea growth?
Old 11-16-2020, 04:22 AM
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No
Old 11-16-2020, 04:49 AM
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Ditto,..... No.
Old 11-16-2020, 07:32 AM
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Vandal or

15 years ago you would always feel the sinker hitting hard matter and now it feels like mud
Old 11-16-2020, 08:43 AM
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Towboats have large wheels but avoid thin water at all costs. Often their tows, barges mostly, draft 9 or 10 feet. If they go aground they are in big trouble.
Old 11-16-2020, 08:46 AM
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Originally Posted by Butch Davis View Post
Towboats have large wheels but avoid thin water at all costs. Often their tows, barges mostly, draft 9 or 10 feet. If they go aground they are in big trouble.
I am aware of this. I don't have any illusion that they can touch the bottom. I am talking about prop angle and the piece thrust that comes out from the tug and whether the prop wash will affect the bottom 70 feet below. Ever crosss behind one of these? I have a big boat and it pushes you around like a cork. so I wonder how far down the thrust goes.

Old 11-16-2020, 08:54 AM
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Much more likely it is silt and sediment run off into the rivers and accumulating offshore.
Old 11-16-2020, 09:28 AM
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I doubt if the prop wash extends more than 20-30 feet below the surface and would diminish progressively as you go deeper. The prop angle isn't very steep on any tugs I've seen to allow for max. forward thrust. In fact, they're almost horizontal.
Old 11-17-2020, 08:16 AM
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Yes, the shaft is almost if not completely horizontal. The wheel's thrust is essentially straight except when backing. When backing the thrust hits the deep part of the hull where the engine compartment is located. Towboats lose much of their power when backing. Tugboats are completely different animals with different hull shapes so maybe tugboat knowledgeable people can add $.02 worth.
Old 11-17-2020, 08:34 AM
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No effect at 70'.

Most silt comes from rivers and sand ground up by wave action on the beach.
Old 11-17-2020, 08:59 AM
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I have been flounder gigging here before when right when we were about to get started at twilight the tugs and a container ship started to depart from the port. We were probably only a half mile away and up a creek mouth a little bit. It turned the entire creek to mud and you could see it coming like like a giant cloud.

I'm not saying it disturbed the silt in 70' of water, but the combo of tugs and container ship certainly disturbed the entire river while leaving the port in 45-50 feet of water.
Old 11-17-2020, 12:20 PM
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Originally Posted by CUTiger2011 View Post
I have been flounder gigging here before when right when we were about to get started at twilight the tugs and a container ship started to depart from the port. We were probably only a half mile away and up a creek mouth a little bit. It turned the entire creek to mud and you could see it coming like like a giant cloud.

I'm not saying it disturbed the silt in 70' of water, but the combo of tugs and container ship certainly disturbed the entire river while leaving the port in 45-50 feet of water.
I've been blown out shore fishing on the Ohio river by two tugs bow to bow one using the other to clear a pump station. Amazing to watch.
Old 11-17-2020, 01:56 PM
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I'm can't imagine it has anything to do with tugs or other commercial traffic. Currently the amount of leaves in the water in the LIS is enough to silt up the entire bottom.
It's been a fantastic season for us sadly it's coming to a close quickly.
Old 11-17-2020, 02:19 PM
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Originally Posted by CUTiger2011 View Post
I have been flounder gigging here before when right when we were about to get started at twilight the tugs and a container ship started to depart from the port. We were probably only a half mile away and up a creek mouth a little bit. It turned the entire creek to mud and you could see it coming like like a giant cloud.

I'm not saying it disturbed the silt in 70' of water, but the combo of tugs and container ship certainly disturbed the entire river while leaving the port in 45-50 feet of water.
Ships in harbors/rivers/channels create a heck of a surge that goes way up into tributaries. I'm on a creek 500yd off the ICW and can tell when a loaded barge goes by. Lots of water moves in and out of the creek, bangs boats around and stirs up the bottom. Same thing does not happen offshore.
Old 11-17-2020, 02:25 PM
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Originally Posted by LISteiger View Post
I'm can't imagine it has anything to do with tugs or other commercial traffic. Currently the amount of leaves in the water in the LIS is enough to silt up the entire bottom.
It's been a fantastic season for us sadly it's coming to a close quickly.
I agree but I think that fishing (giving away my age) for over 50 years I will NEVER be able to figure these things out other than to say I know of some patterns when they bite and when they don't, assuming you find them. I am always amused at what other fishermen say "they go to this spot ti stage for the tide" or they are no eating because the moon is at such and such stage. People don't realize that no matter what you put in front of them sometimes they don't eat. I can post photos of striped bass on the bottom that simply did not eat no matter what was presented.



Bass not hungry


Old 11-17-2020, 02:33 PM
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Hi Butch,
Thank you for your knowledgeable response.
Most of what we have are push tugs, pushing giant barges, back and forth through the lanes. I had no idea the the configuration might be different for different uses but that makes a lot of sense. I learn something on this site every time I access it.
I appreciate the input of the many readers here.

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