Thanks Ric, for your reply. Sorry I didn�t get back to you sooner, but I�ve been dealing with Prostate Cancer. (I would highly recommend the DaVinci Robotic Prostatectomy, for those of you who are dealing with prostate cancer. I�m 51 yrs old, PSA of 2.5-3.1, & normal sized prostate! If you have any questions, email me. I also take Personal Messages.)
We found why the old dam washed out, it had never been cored. They had just pushed the dam material on the top of the soil.
We removed all the trees, (6-20� in diameter), and the roots as best we could. Then we dug a new core on the face of the old dam and through the washed out area; filled with clay & packed with a sheep�s foot & scraper. The pond filled in May, and so far no leaks! Hopefully. the roots we missed won�t present a problem when they rot! I will keep you posted.
Mark