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 (1991) | 25th percen- tile | Median | 75th percen- tile | Mean | Most Recent Instantaneous Value Jul 31 | Max (1992) |
|---|---|---|---|---|---|---|
| 0.62 | 4.9 | 12 | 18 | 20 | 20.8 | 229 |