Station list
05553500 ILLINOIS RIVER AT OTTAWA, IL
LOCATION.--Lat 41°20'32", long 88°50'48", in SE¼SW¼ sec.11, T.33N., R.3E., LaSalle County, Hydrologic Unit 07130001, 0.3 mi downstream from Fox River, 0.3 mi downstream from State Highway 23, and at mile 239.4.
DRAINAGE AREA.--10,949 mi2.
PERIOD OF RECORD.--Water year 1997 to current year.