You can go a bit steeper with the banks to get more depth. I'd go 4:1 for the first 20-25 feet on the side of the pond that is closest to the house, then transition to 3:1 and do 3:1 starting from the waterline out on the 3 sides (or so) that are away from the house. You really need more depth than the 10' to help combat the pond from getting too shallow if rainfall isn't what you expect it to be.

Ponds can be kept full from a well, it just all depends on how much water is underground. I have enough here to pump over 1,000 GPM if I want to dig a big enough well and pay the energy cost to run that big of a motor. My well currently pumps 25 gpm and that is enough to help raise the pond level. For a pond I would want to have 50 gpm as a minimum. The other water in your area is at roughly 1125' elevation and at 1120' elevation so if your ground will hold water you should be OK.

If the ground won't hold water, depending on budget, you could always go with a liner. Bookmark this website and keep it for a resource "just in case". https://www.btlliners.com/

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