Food for thought...a 60ft x 60ft square pond is about 25% more square feet than a 60 ft diameter one....
FWIW There are several members that let there ponds freeze over in the winter for skating. IIRC they put effort into snow removal from the ice to let light into the pond and I suspect you want the pond to have a good bit of the area 10 or 12 feet deep. I am definitely not a pro so hopefully, one will provide input.
Last edited by Bill D.; 05/05/15 02:54 PM.