Park Service officials went out on the lake near Cornucopia, Wisconsin, on Friday to test the ice. The park’s chief of planning and resource management, Julie Van Stappen, says officials found the ice sheet along the length of caves “really fractured” and rough.
She tells Minnesota Public Radio News the snow also is insulating the ice, so instead of hard, solid ice, the team encountered soft, porous and slushy ice.
The ice caves were last accessible to the public in 2014 and 2015. But warm weather since then has prevented formation of ice thick enough to support throngs of visitors.
Photo courtesy of the University of Michigan