Illinois flood information from USGS and NOAA

flooded river and bridge
Record floods in Illinois rivers recorded in April 2013

Courtesy of Emily Wild, USGS librarian and scientist:

USGS Flood information, National, or select state of interest, e.g. Illinois 

These two web sites show the same data: USGS and NOAA.  When it comes to forecasting the river data, NOAA takes over the data interpretation.

Be safe out there if you are near a high river with Flood Safety Information.