What Happened Lake Agassiz?
What Happened Lake Agassiz? What happened Lake Agassiz? The lake probably completely drained from North Dakota by 9,900 years ago, but between 9,900 and 9,500 years ago, the glacier readvanced in Canada, blocking the eastern outlets to Lake Superior. Lake Agassiz flooded the Red River Valley again, draining southward into the Minnesota River. Why did