So much broken ice has flowed from Lake Erie in recent days that Niagara Falls has become partially blocked.
High winds on Sunday smashed sections of the frozen surface of the lake and now huge slabs of ice are flowing down the Niagara River.
Much of that ice is collecting at the famous falls, reducing the volume of water.
A video filmed on Monday showed the Bridal Veil Falls - the smallest of the three waterfalls which make up Niagara Falls - had almost completely stopped flowing.