Clam Lake Canal
... that when Clam Lake Canal freezes over early in the Michigan winter, the lakes on each side remain unfrozen, but when the lakes later freeze over, the canal thaws and flows once more?
... that when <b id="mwCEY"><a href="./Clam_Lake_Canal" id="mwCEc" rel="mw:WikiLink" title="Clam Lake Canal">Clam Lake Canal</a></b> freezes over early in the <a href="./Michigan" id="mwCEg" rel="mw:WikiLink" title="Michigan">Michigan</a> winter, the lakes on each side remain unfrozen, but when the lakes later freeze over, the canal thaws and flows once more?