We live in southern NJ. My husband and I built a small preformed pond 16 years ago. it was only 18 inch deep, suddenly in 2014 after the bad winter most of our fish died. Found out the pond was not deep enough, plus we had too many koi's. So we decided to build a big one, we priced it out, the pond companies were asking too much money. So we decided to tackle the project our self. After watching so many YouTube videos and tons of reading, with a help of our neighbor’s friend who owned a backhoe helped us with the digging. (Thanks Joe) The pond is 33 feet by 35 feet wide. and 4.5feet in depth (in the middle part of the pond) have three shelves around. After the initial digging of the pond, we had to go in and cut all the roots and clean out the shelving and scoop out any rocks and soil that you don't need. The quote for this pond by a pond builder was 59,750. (not kidding). It cost us fraction of the price, we used all high end materials too. You can see the price at the bottom of the page. We did this entire thing in four weeks. We worked on weekends(12 to 13 hours a day)and some evenings. Also here is the link to our garden.. https://get.google.com/albumarchive/114918588986533270665/album/AF1QipPgqtDp_y2SzOtj3SLlnX0sVYQZ4KY_-_HTAF35 If anyone need any information on selecting material or about making a pond. Please ask here. I will be more than happy to help you out.