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  #1  
Old 11-27-2020, 11:49 AM
petehowell's Avatar
petehowell petehowell is offline
 
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Location: MN
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Default River Bumps

Was flying over the Upper Mississippi this morning and got a good look at something I had seen before. I called them river bumps. (Circled in red)

Here is the pic. They are too uniform not to be man made. Does anyone know their purpose? I'm thinking they help define the barge channel.

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Last edited by petehowell : 11-27-2020 at 04:14 PM.
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  #2  
Old 11-27-2020, 12:00 PM
lr172 lr172 is online now
 
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Not a civil engineer, but my first guess would be some mechanical abutment that is disrupting the bottom flow/current at the edges with the goal of forcing deposits to occur at the edges and forcing all of the bottom erosion to occur in the center of the river to avoid dredging activities. Dredging is expensive and on the mighty Miss, I would expect the army corp to take proactive steps to minimize dredging expenses and keep the shipping lane deep.

Larry
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Last edited by lr172 : 11-27-2020 at 12:06 PM.
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  #3  
Old 11-27-2020, 12:11 PM
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petehowell petehowell is offline
 
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Default THnks

Hey Larry,

That makes perfect sense to me. Hope you had a good Thanksgiving!

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Originally Posted by lr172 View Post
Not a civil engineer, but my first guess would be some mechanical abutment that is disrupting the bottom flow/current at the edges with the goal of forcing deposits to occur at the edges and forcing all of the bottom erosion to occur in the center of the river to avoid dredging activities. Dredging is expensive and on the mighty Miss, I would expect the army corp to take proactive steps to minimize dredging expenses and keep the shipping lane deep.

Larry
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  #4  
Old 11-27-2020, 02:17 PM
David Paule David Paule is offline
 
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I don't see the photo....

Dave
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  #5  
Old 11-27-2020, 03:16 PM
BillL BillL is offline
 
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What photo?
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  #6  
Old 11-27-2020, 03:44 PM
NLPete NLPete is offline
 
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Pete, I can't see the photo but are you looking at a wing dam? There are a bunch of them in the Mississippi. I watched a guy get pitched off the back end of a boat that hit one. The boat driver didn't know about the dangers of them (or what the buoys were for either). https://en.wikipedia.org/wiki/Wing_dam
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  #7  
Old 11-27-2020, 04:18 PM
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petehowell petehowell is offline
 
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Default Not wing dam(I dont think)

Hi Nathan,

Did not look like a wing dam. Hopefully the pic will show up for everyone - Google Photos can be fussy, but they usually show up.


Quote:
Originally Posted by NLPete View Post
Pete, I can't see the photo but are you looking at a wing dam? There are a bunch of them in the Mississippi. I watched a guy get pitched off the back end of a boat that hit one. The boat driver didn't know about the dangers of them (or what the buoys were for either). https://en.wikipedia.org/wiki/Wing_dam
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  #8  
Old 11-27-2020, 05:28 PM
swjohnsey swjohnsey is offline
 
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Yep, wing dams.
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  #9  
Old 11-27-2020, 05:44 PM
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petehowell petehowell is offline
 
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Default Thanks!

Stan and Nathan,

Thank you!

I missed this in the Wiki "Many wing dams are often underwater and may be difficult to see, and can easily be struck by vessels."


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Originally Posted by swjohnsey View Post
Yep, wing dams.
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  #10  
Old 11-27-2020, 05:50 PM
Desert Rat Desert Rat is online now
 
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Those are definitely wing dams/dikes. the encourage the current to keep the shipping channel scrubbed deep enough that it minimizes dredging requirements.

I race Kayaks on the Missouri and every year somebody or other will poke a hole in a boat by hitting one of those just under the water. They can be either underwater of high and visible, depending on teh river level, which changes quite a bit more that you would think.
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