Illinois Department of
Natural ResourcesStreamflow 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.
| Min (1940) | 25th percen- tile | Median | Most Recent Instantaneous Value Jan 8 | Mean | 75th percen- tile | Max (1998) |
|---|---|---|---|---|---|---|
| 0.00 | 4.2 | 9.6 | 10.8 | 25 | 36 | 200 |