Hi,I am in New Hampshire,I have two ponds one is about 600 gallons and been in place about 10 years although last year I had to replace the whole liner....my second pond my husband and I started last may .it is 40 thousand gallons....and quickly looking like it has been there forever...the spot it is we planned for years in advance one year remove trees next year remove stumps etc it was a process but well worth it