Unless it gets into the mid-twenties and stays there for a long time (6-12 hours), you have nothing to worry about. If you look at the detailed forecast tables, you will see that the freezing temps forecast are only for an hour or two, and barely dip below freezing.
And as Pine Island Guy said, the water in the lake is still near 60 so it's doubtful you will even see the freezing temps. Worst case, open a spigot to a drip and keep that 60 degree water flowing through the pipes.
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