Heath,
Before you go too far in your pond building adventure, I would recommend two books on the subject. They may be available at your library and I know are available at amazon.com (or at least they were a couple years ago.
They are:
Ponds- Building, Maintaining, Enjoying by Carolyn Garrick Stern. Published by Progressive Farmer, Inc in 1996
Earth Ponds Sourcebook by Tim Matson. Published by The Countryman Press in 1997
These two books go through the whole process, Stern's even has minimum depths by location in the country based on rainfall. I have found them most useful and would have liked to have read them before, not after, I had a pond. I would have done things differently. Kind of like finding Tractorbynet after buying a tractor. /forums/images/graemlins/smile.gif
Bill