Thanks for your replies. The one idea is probably more expensive than I want to go. The stock tank is a possibility. My reason is to have a pond the @%$&$#* raccoons can't get into. Thanks again.
Olcoach,
I have a cabin on a river with lots of trees and it is rather secluded. There are hundreds of raccoons here and I guarantee you that they can and will get into just about any pond or tank except those with bars and heavy wire screens and locks on it. I have found that the depth of the water really does not deter them from fishing in the pond or tank. They will hang over the edges and snatch the unwary fish which come too close to the edge with uncanny skill and agility. We have observed them doing this and it is actually quite amazing.
We keep live fish for fishing bait and often place our caught fish in metal stock tanks 30 inches deep and the raccoons still get into them. We have had to weld metal frames covered with 1/8" expanded metal screening set on heavy metal hinges and locked down to keep them out of our tanks. I doubt that you want a pond or a tank fitted with such a lid. It looks quite obnoxious.
However, I have an idea that might work very well with any pond or tank and this will grant you more freedome to create whatever type of pond or tank you desire.
Encompass the perimeter of the pond or the rim of the tank with really sturdy, non-conductive stakes set like miniature fenceposts and fix two strands of non-insulated (bare) #14 to #10 gauge solid wire to these stakes. The lower wire being set about two to four inches above the ground or rim of the pond or tank and the upper wire being set four to five inches above the first wire. Then connect these wires to an electric cattle fencer.
You can turn the fencer off during the day when the raccoons aren't normally about, but at night, I guarantee they will get your definite message to stay the hell away!
If you use decorative stakes then that will improve the aesthetics and solid copper wire will develop a nice patina over time.
Gordy