The Bois Brule River Valley and the upper St. Croix River valley were carved by melt water flowing south from glacial Lake Superior and the surrounding uplands. When the glaciers receded, a divide was formed from which the Brule and St. Croix Rivers flow today in opposite directions. A portage was established between these two rivers, connecting Lake Superior and the Mississippi River watersheds. It was used by early native people and later by European explorers, traders, trappers, and missionaries.
Today, the Brule offers world-class trout fishing and some of the best paddling in Wisconsin and the Upper Midwest.