FOLEY, Minn. — A16-year-old boy was treated for hypothermia after his snowmobile hit a patch of open water on ice-covered Little Rock Lake north of Sauk Rapids. He’s OK, said Benton County Sheriff Troy Heck. A witness on shore saw the youth slow the snowmobile when he spotted the open water ahead – but it was too late. As the snowmobile sank, the youth managed to climb onto ice and walk to a fish house and find an angler. The angler took him to the St. Regis Park landing and then to a hospital. Sheriff Heck said that lake ice wasn’t t yet ready for vehicles, despite a recent cold spell.