National Water-Quality Assessment Program
Upper Illinois River Basin
National Water-Quality Assessment Program
Upper Illinois River Basin
For a more detailed description of the Basin, see the Environmental Settings Report (WRIR 98-4268)
The upper Illinois River Basin includes parts of northeastern Illinois, northwestern Indiana, and southeastern Wisconsin. The drainage area of the UIRB is 10,949 mi² upstream of Ottawa, Illinois, on the Illinois River, and contains the following major subbasins (hydrologic units): Kankakee River, Iroquois River, Fox River, Des Plaines River, Chicago River, and Illinois River.
Fact Sheet about the Study (FS-072-98)
Return to the Upper Illinois River Basin page