Quote:
Originally Posted by Steveo
You should really wait for all the ice to go and the lake to get up to about 50 degrees or above. That way the water acts as a heat source to those cold night below freezing. The air temperature around the waters edge will be about 10 degrees warmer than inland during short periods of freezing weather.
Worst case is that the pipes (and pump) might freeze up but won't get so cold to do damage. Just have to wait for them to thaw before you can flush. 
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Waiting for the lake to hit 50 degrees is being a bit over cautious. Based on last years figures that would mean you would not turn your water on until around May 9th (
http://www.winnipesaukee.com/tempcal/index.cgi).
We always turn ours on so that we can stay out the first weekend after ice-out, which is as soon as ISS can get out to do it. Ours will probably go on tomorrow provided they have time to get to it. Never had a problem in the last 6 years of being there.