The St. Croix River begins just north of Solon Springs, Wisconsin. The Brule (or Bois Brule) River also begins just north of Solon Springs. The St. Croix flows south and eventually joins the Mississippi. The Brule flows north into Lake Superior. The sources of the two rivers are only a few hundred yards apart. A person can easily visit both in the same day using the Brule – St. Croix Portage, part of the North Country National Scenic Trail. The portage has been in use for centuries as a transportation link between the Lake Superior Watershed and the St. Croix River Watershed. The source of the St. Croix is in a swampy wood with moss, lichens, and fallen trees. The St. Croix begins as St. Croix Creek. The creek flows less than a mile before entering Upper St. Croix Lake.