If you have downscan try the split screen this will easily tell you if it's a brush pile or just a rock hump.

Brushpile.

Giant turtle...

There's a lot of money to be made if someone could write a definitive book on how to read what's on the screen of your electronics!

Space Shuttle nosecone.

Tell you what, only cuz I'm such a great guy, send me exact GPS coordinates and I'll run over it with the down scan and we can end the debate.

I would also say it is a brush pile with something hard on top of it.

I am going to go with road or maybe a spot where they had to build it up for a road and put in a culvert over a low spot.Could be where they removed a old bridge and pushed it to the side.

I have a spot on Fork where they took out a bridge and pushed it to the side and it kind of looks the same as your pic.On SI you can really tell it is concrete and can see most of the slab that was removed.

For what reason does anyone do this I cannot say but they seem to do it on all lakes especially the older ones. What ever is in the center is harder than brush IMO. Has to be concrete. IMO

After looking at it again the side seem to be softer than the middle. Could be a area pushed up by a dozer and it had some rock in it.

Very hard return--concrete or metal. I'd guess a piece of bridge or sunken car.

Dark orange/reddish hardest return
Then yellow
Then cream colored
Then green colored
Then blue softest return

So, your 2D image shows a surface of an object with hard return signal in the middle (yellow) with a harder return (dark orange around the yellow) to a straight edge on two sides, with a soft blue return (algae/silt/vegetation/bait fish) sloping off the sides.

To get a better picture, you would need 455/800 kHz DI

I agree, that's a big block of concrete or something of similar density. I often see the speckled black/white 45 degree image right next to a steep vertical drop of a solid surface. I don't recall ever seeing that for what I knew for a fact was a brush pile. The sloped side to the right may be a software-interpretation artifact, something that's not really there.