What is this structure?

[LrgmouthShad]

Hey y’all,

 

Curious what you might call this structural feature. Deeper water pinches closer to the shoreline compared to surrounding banks. How do these develop and what is the significance of them? 

[WRB]

In the west we call those a ravine, some call them a drain or cut.

Tom

[MN Fisher]

1 hour ago, LrgmouthShad said:

Curious what you might call this structural feature.

 

2 minutes ago, WRB said:

In the west we call those a ravine, some call them a drain or cut.

Tom

Up here we call it a Cut.

 

If you had the topography of the land around there, you might see where it originates as well....usually there's a corresponding land feature - at least in natural lakes...which is basically all we have up in Minne-snow-ta.

[casts_by_fly]

1 hour ago, LrgmouthShad said:

Hey y’all,

 

Curious what you might call this structural feature. Deeper water pinches closer to the shoreline compared to surrounding banks. How do these develop and what is the significance of them? 

 

The above ground topo will show you how it formed.  I bet that there is a minor stream or seep that was there before the lake was flooded.  It eroded down the soil/rock and that's what's left.  Given the round bits at the 'bottom', I'd even suspect there might have been a waterfall there at one point as those look like plunge pools.

Think something like this on a smaller scale.

 

[Catt]

58 minutes ago, WRB said:

In the west we call those a ravine, some call them a drain or cut.

Tom

 

54 minutes ago, MN Fisher said:

Up here we call it a Cut.

 

Ravine, Cut, Drain, or Washout; all are created by rain water running down hill causing erosion. 

 

Would definitely like to see the surrounding topography.

[Way north bass guy]

Up here in the Canadian Shield, that could be one of several things. Sometimes it’s like everyone else mentioned, where running water has “cut” through the ground to create a depression, but most times around here that’d just be an “inside turn”. Simply put, it’s a cut, or depression in the rock, but it was made by about a mile thick slab of ice crawling across the land thousands of years ago. 

[Tennessee Boy]

There are a few similar things on my local lake.  Around here we call them sink holes.  It all depends on the surrounding terrain.  

 

[BigAngus752]

If the shoreline funnels down to that drop we would call it a "drain" around these parts.  If the shoreline is perfectly level and shows no trace of it we would call it "weird".  I'm fishing it either way. 

[WRB]

Simply judging by the straight road way adjacent to the structure feature it appears to relatively flat to gentle sloping terrain.

This makes the structure nearly un noticed and more then likely less fishing pressure. 

 

[PressuredFishing]

Learning something new every day great thread op

[GRiver]

LrgmouthShad, is this a man made lake?

[MickD]

The significance of them is that fish like to have close access to deep water when they are feeding on flats or weed edges, so they most likely will use them as refuge when they leave shallow water and going to and from shallow water.  I would check them out regularly, and the shallows (meaning the less deep flats between them) close to them.  

[Tennessee Boy]

I would love to see a google earth image of the surrounding landscape.   

[Catt]

43 minutes ago, Tennessee Boy said:

I would love to see a google earth image of the surrounding landscape.   

 

YES!

 

And a more detailed topographic map. Based off what I see, nothing interests me.

[scaleface]

 That is one weird looking area and look at those three deep holes . I never seen anything like it .    . 

[LrgmouthShad]

22 hours ago, Tennessee Boy said:

I would love to see a google earth image of the surrounding landscape.   

 

21 hours ago, Catt said:

 

YES!

 

And a more detailed topographic map. Based off what I see, nothing interests me.

I can work on this later. Thanks y’all.

 

Been too busy to do it yet

[Jig Man]

What ever you want to call it I see that middle one getting some jigging spoons in that deep depression.

[casts_by_fly]

So I'm not the OP and I'm not going to put out what lake it is, but with a little guestimation and 10 minuets of time looking at maps, I've found the spot.  I'm going to pose an alternative hypothesis that no one has put out yet- quality of data.  And the only way to confirm that will be for the OP to get on the water with a depth finder and map it himself.

 

Original image:

 

 

 

My own image from same website (his 40' teardrop at top matches my bottom of the three):

 

 

Google earth/terrain shows flat all around, though right at the water line there is a bit of a bluff.  Looking at this lake zoomed out, it appears to be a missouri bluff style lake similar to Lake Truman or Lake of the Ozarks.  I can't snip google earth small enough for some reason, but you can see actual minor cuts like this all up and down the shoreline for the whole lake.  I suspect those are actual erosion cuts, but we're talking 10-20' wide. There are also 3 boats on this quarter mile strip, so its not an unknown honey hole.

 

You can also see these much larger drains in the depth map on fishermap all over the lake.  But if you look critically at them as a whole instead of one by one, you can see that they follow the creek channel down the whole lake.  When you compare vs Navionics, it is a much more smooth view of the lake:

 

 

 

 

I recon that there IS some under water variation on the bottom, but that the fishermap depth map has limited data points.  Its taken the main lake creek bed spots that are deep and in between extrapolated that the cuts run right up to the shoreline.  Navionics probably has better data and more data points to make a smoother graph.

 

Unfortunately, the only way to really confirm it is to map it in person (or talk to someone who has fished it and can confirm it).  

 

<\internet sleuthing off>

 

thanks

rick

 

 

Here is a little snip from google maps.

 

[Catt]

@casts_by_fly Dude that's some serious investigation right there!

 

[LrgmouthShad]

31 minutes ago, casts_by_fly said:

So I'm not the OP and I'm not going to put out what lake it is, but with a little guestimation and 10 minuets of time looking at maps, I've found the spot.  I'm going to pose an alternative hypothesis that no one has put out yet- quality of data.  And the only way to confirm that will be for the OP to get on the water with a depth finder and map it himself.

 

Original image:

 

 

 

My own image from same website (his 40' teardrop at top matches my bottom of the three):

 

 

Google earth/terrain shows flat all around, though right at the water line there is a bit of a bluff.  Looking at this lake zoomed out, it appears to be a missouri bluff style lake similar to Lake Truman or Lake of the Ozarks.  I can't snip google earth small enough for some reason, but you can see actual minor cuts like this all up and down the shoreline for the whole lake.  I suspect those are actual erosion cuts, but we're talking 10-20' wide. There are also 3 boats on this quarter mile strip, so its not an unknown honey hole.

 

You can also see these much larger drains in the depth map on fishermap all over the lake.  But if you look critically at them as a whole instead of one by one, you can see that they follow the creek channel down the whole lake.  When you compare vs Navionics, it is a much more smooth view of the lake:

 

 

 

 

I recon that there IS some under water variation on the bottom, but that the fishermap depth map has limited data points.  Its taken the main lake creek bed spots that are deep and in between extrapolated that the cuts run right up to the shoreline.  Navionics probably has better data and more data points to make a smoother graph.

 

Unfortunately, the only way to really confirm it is to map it in person (or talk to someone who has fished it and can confirm it).  

 

<\internet sleuthing off>

 

thanks

rick

 

 

Here is a little snip from google maps.

 

Wow. Thank you for that analysis very much. 
 

Didn’t mean to be secretive about the lake. It is the same lake as my dam thread - Pomme de Terre. 
 

As you say, I was curious about those cuts scattered across the shoreline of this lake and wanted to know what they are. Not really sure what I want to be doing with this lake yet. I might be bank-ridden or at some point I might try and take the kayak out for a short spin or rent a boat. We’ll see.

 

Ive found no point to being secretive about large lakes that I fish on. Told everybody I was on Badin in the summer. I’m not a good enough fisherman for anybody to care ?

[Catt]

Just a dumb Cajun's opinion but while y'all looking at that I be out here looking at this.

 

[casts_by_fly]

With the cat out of the bag for what lake it is, here is the Fishermap of the bigger lake I was referring to with the creek channel pockmarks down the lake.  You can't convince me that every one of those is actually a depression on the bottom.  Navionics pretty much agrees.  There are depressions, but its nowhere near as pronounced or as localized as the fishermap.  

 

 

And here is a side by side of the same point further up the lake to illustrate it better.  I generally trust navionics to be pretty close.

 

[casts_by_fly]

30 minutes ago, Catt said:

Just a dumb Cajun's opinion but while y'all looking at that I be out here looking at this.

 

 

There is a lot of that kinda of stuff on this lake it seems.  This spring I'd be in this area.  All of those steep cuts leading into pre-spawn flats.  I'm not an expert on them, but I bet rolling an A rig through there might be the ticket.

 

[LrgmouthShad]

Just now, casts_by_fly said:

 

There is a lot of that kinda of stuff on this lake it seems.  This spring I'd be in this area.  All of those steep cuts leading into pre-spawn flats.  I'm not an expert on them, but I bet rolling an A rig through there might be the ticket.

 

Oh my. That’s a pretty lookin area

[Catt]

Look at all them underwater points!