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 (1963) | 25th percen- tile | Most Recent Instantaneous Value Feb 21 | Median | Mean | 75th percen- tile | Max (2018) |
|---|---|---|---|---|---|---|
| 28.0 | 227 | 372 | 482 | 850 | 1040 | 5830 |
U.S. Department of the Interior |
U.S. Geological Survey
Title: USGS Surface-Water Historical Instantaneous Data for the Nation
URL:
Page Contact Information: Illinois Water Data Support Team
Page Last Modified: 2026-02-21 06:24:49 EST
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