
2007: Mystic River
Presque Isle River is the largest river in the Porcupine Mountains, draining over 300 square miles of forest land in the Upper Michigan and Northern Wisconsin. The amber colored water of the river, and the persistent foam beneath the waterfalls, are largely the result of tannin and other water-soluble plant compounds that wash into the river as it journeys to meet Lake Superior. The finely terraced rock over which the river flows is called the Nonesuch Shale. It is composed…