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When using a flasher type fish finder, a hard bottom is displayed as a wide red band on the screen indicating a good return signal. The wide red band in the picture below covers between 10 and 12 feet.
Exactly where is the bottom? 10 feet? 12 feet? or in the middle at 11 feet?
The bottom is at 10 feet.
Here is a diagram showing what things are showing.
Here are a couple of links of for help in reading what the finder is showing you. https://www.flwfishing.com/tips/2005-02-04-abcs-of-understanding-flashers-fish-finders-for-bass-fishing
http://www.vexilar.com/blog/2014/08/28/how-to-ice-fish-with-a-vexilar-flasher
The other colors below the bottom are coming from echos from your transducer going through the ground a little ways before bouncing back to you. The hard red implies to me that you have a hard bottom with little silt. If it was more like the above image, there is a little bit of muck and things at the bottom (or it could be plants). Something that doesn't bounce sound waves very strongly (like rocks).
