So What’s a Glacial Lake?

You can’t drive a mile in Northeast South Dakota without spotting a lake, or at least it feels like that. But why? Way back in the day, around the time of the last ice age, present-day South Dakota was covered by glaciers. They were pretty big. When those glaciers went north, they carved out huge gashes in the land, which filled with water and became the sparkling blue lakes we know and love. So the next time you’re casting a line or roasting a marshmallow, thank a glacier.