I asked snrub the same thing about the hump in the forage pond.
That is actually the old "edge" of the pond. He dug the original pond with his dozer. He later decided that he wanted a slightly larger pond - so he dug out a little more on one end using only his backhoe.
We found out the hard way that the bottom of the original pond that was compacted with dozer treads was much firmer for walking than the bottom of the portion that was excavated with a backhoe on the bank and never compacted at all!
If the muck had been any deeper - we would have needed to go on a Snipe hunt.
