I'd say the pond is jsut shy of 3 1/2 feet with 2 shallow areas that get about 10 inches deep. As far as gallons, I have no idea. I was useing this as a holding pond for awhile because we were selling some of our koi pretty soon because we had to many.How deep is the pond?
How deep and big is the shallow area?
How many gals. on the pond?
now THAT is a great idea!put one of those plastic crates at the bottom held down by some rocks, slate, or maybe even some potted plants. fish should be able to get in and out the holes while racoons wont be able to. just an idea man let me know how it works if you decide to try it out.