Here in Texas, we clean out ponds with a dragline. It is nothing but a crane with a large scoop attached, along with cables that drag the scoop toward the machine. So the scoop is lowered into the pond, then dragged forward; digging dirt out. The cost is high per hour, but lots of dirt can be moved. It will leave piles of dirt around your pond. In order to clean that up, a dozer is needed. So overall cost will be at least 1000 dollars.
