Streamflow discharge was last observed at 43,700 cfs, and a gauge height of 11.93 feet.
With the
% decrease since yesterday,
the streamflow average over the past 10 days is 49,470 .
Weather today, Tomorrow,
The river is fed by numerous tributaries, including the Mackinaw and Spoon rivers. The Dresden Island and La Grange Lock and Dam are two notable structures on the river that can affect the flow. Seasonal trends show higher flows in the spring due to snowmelt and precipitation, while lower flows are common in the summer and fall. Interestingly, the Illinois River was once a major transportation route for trade and commerce in the Midwest. Today, it remains an important source of drinking water for many communities in Illinois.
| Elevation | 433.0 ft |
| Last Updated | |
| Gage height, ft | 11.93 ft |
| Streamflow, ft³/s | 43700.0 ft3/s |
| Percent of Normal | 184% |
| Year Over Year Average | 23,700 cfs |
| 24hr Flow Prediction | cfs |
| Maximum Recorded | 184,000 cfs |