I am uploading a few photos of the upper end now that I have removed the muck as suggested earlier. I think it's going to be a great improvement, as it should result in about 2-3 feet of additional depth, better control of brush, and a nice habitat for wildlife/filtration, etc. Note that the "before" photo is a winter photo - during the summer this area is full of briars and brush. I am looking forward to seeing this area as a 3-4 foot filtration pond, complete with with frogs, etc. and more desirable plants.