Strong northeast winds and giant waves battered Lake Superior's north and south shores Wednesday, strewing rocks and debris, flooding low-lying areas and forcing officials to close roads and beaches.
Winds frequently gusted near 50 miles an hour or more near Duluth and some waves measured 20 feet, according to the National Weather Service. A Canadian freighter measured an 86 mph wind gust off the shore near Castle Danger about 12:30 a.m.
Duluth, sitting at the westernmost point of the lake, was believed to have taken the biggest brunt of the waves. Standing water forced the city to close much of Canal Park, the popular tourism area near the iconic lift bridge. Only residents of Park Point and those with business in the area were allowed past Buchanan Street, police said. Officials warned of rocks and debris on flooded streets and the popular Lakewalk.
Harbor Drive behind the Duluth Entertainment Convention Center was also deemed inaccessible, and the city closed Brighton Beach farther up the shore.
But flooding and damage extended up the North Shore and into Wisconsin, too. Roads were closed in Ashland County, Wis. In Minnesota's Cook County, near the Canadian border, officials closed County Road 69 in Hovland because of flooding. In downtown Grand Marais, waves crashed into the parking lots at Artists' Point, carrying rocks with them, according to Mayor Jay Arrowsmith DeCoux.
In Duluth, the strong winds pushed the lake level up about 10 inches.
Strong storms are not unusual on the lake in the fall season, weather service meteorologist Greg Frosig said.
"It's just that it's a long-lasting one," he said. "It's been affecting us for a couple of days."