Warning: Thin Ice! An aeration system creating open water and thin ice will be operating on Mountain Lake Lake in Cottonwood County, Township 106, Range 34, Sections 28 to 33, from December 1 through March 30. Weather conditions may cause the areas of thin ice and open water to fluctuate greatly. Stay clear of the marked area! when If there are questions concerning this aeration system, please call 507-427-2999. ISLAND Thin Ice Open Water Warning : Thin Ice ! An aeration system creating open water and thin ice will be operating on Mountain Lake Lake in Cottonwood County , Township 106 , Range 34 , Sections 28 to 33 , from December 1 through March 30 . Weather conditions may cause the areas of thin ice and open water to fluctuate greatly . Stay clear of the marked area ! when If there are questions concerning this aeration system , please call 507-427-2999 . ISLAND Thin Ice Open Water