The federal Bureau of Reclamation is warning of rapidly changing ice conditions on Lake Audubon.
Low temperatures have caused ice to form on the lake, and ongoing lowering of the lake to a winter operating level is creating rapid shifts in ice stability and safety.
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"Changing water elevations create dangerous areas of thin ice, creating unsafe conditions for individuals recreating on the lake," said Arden Freitag, manager of the bureau's Dakotas Area Office. "These fluctuating water elevations will change ice conditions without any prior warning."
The drawdown on the lake north of Coleharbor should be completed by Nov. 20.