Streamflow information saves lives and protects property during floods. Information on the streamflow in the Nation's rivers also helps to ensure adequate water resources for a healthy environment and economy. The U.S. Geological Survey (USGS) operates and maintains a national network of over 7,000 streamgages.
NWS River Forecasts
| Min (1945) | 25th percen- tile | Most Recent Instantaneous Value Feb 19 | Median | Mean | 75th percen- tile | Max (2008) |
|---|---|---|---|---|---|---|
| 40.0 | 200 | 331 | 380 | 630 | 927 | 2650 |
U.S. Department of the Interior |
U.S. Geological Survey
Title: USGS Current Conditions for Illinois
URL:
Page Contact Information: Illinois Water Data Support Team
Page Last Modified: 2026-02-19 20:06:41 EST
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