I'd recommend digging the pond into the ground. This allows the water temperature to be at least partially regulated by the ground temperature.

Spotteds generally live in shallow water, and are not very good swimmers. Make sure they could easily exit the pond.

I've heard of them hibernating in mud, basically. Some will leave the water and bury into the nearby ground. I imagine if you didn't provide a suitable hibernation site, they would leave and find one on their own. Similarly, spotted turtles will estivate during the summer. If conditions aren't right, they will stay underground until the following spring.

I'm curious what area of Michigan you're in.

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