Top Discharges

Streamgauges reporting the most discharge on the Illinois River



10 Day Trend

Discharge comparison for the highest gauges over the past 10 days



Expected Streamflow Ranges

Streamflow discharge range for this time of year

The Illinois River (Miami-Illinois: Inoka Siipiiwi) is a principal tributary of the Mississippi River, approximately 273 miles (439 km) long, in the U.S. state of Illinois. The river drains a large section of central Illinois, with a drainage basin of 28,756.6 square miles (74,479 km2). The drainage basin extends into Wisconsin, Indiana, and a very small area of southwestern Michigan. This river was important among Native Americans and early French traders as the principal water route connecting the Great Lakes with the Mississippi. The French colonial settlements along the rivers formed the heart of the area known as the Illinois ... Source: Wikipedia