On Mon, 9 Jun 2008 07:40:47 EDT, "Pat"
wrote:

I'd rather not have to use a heater. Still would like to know how to find
out what the "frostline" is.

Call someone who puts in foundations for homes.

As far as not using a heater, go deep, you'll still need something to keep
a hole open in the ice so the critters have O2. ~ jan

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Zone 7a, SE Washington State
Ponds: www.jjspond.us