Madison and Jersey Counties | 35,237 Acres
Drains to: Mississippi River
Communities: Alton, Bethalto, East Alton, Elsah, Godfrey, Grafton, Hartford, Rosewood Heights, Roxana, South Roxana, Wood River
Townships and Districts: Alton, Chouteau, Elsah, Godfrey, Quarry East, Wood River
Impairments: Mercury, polychlorinated biphenyls (PCBs), fecal coliform
Watershed Plan Completed: Underway
About This Watershed
The Portage des Sioux watershed is the narrow area from the top of the bluff line to the banks of the Mississippi River in Jersey and Madison counties, below the confluence of the Illinois River and the Mississippi. In this watershed, the water flows through many small unnamed tributaries directly to the Mississippi River, though some parts of Godfrey and Alton drain into Piasa Creek and Shields Branch before discharging into the Mississippi River.
None available at this time.