The St. Croix River, the free-flowing boundary between Wisconsin and Minnesota, is a federally protected National Scenic Riverway. The area's first recorded human inhabitants were the Dakota Indians, whose lands were transformed by fur trade empires and the loggers who called it the "river of pine." A patchwork of farms, cultivated by immigrants from many countries, followed the cutover forests. Today, the St. Croix River Valley is a tourist haven...