Water Resources of Illinois
Welcome to the USGS Illinois Water Science Center. These pages are your source for water-resource information collected and interpreted by the U.S. Geological Survey in Illinois.
Current Streamflow Conditions
On the map to the left, point to one of the stream-monitoring locations to see a summary of current streamflow conditions, or click elsewhere on the map to open a larger view.
Subscribe to WaterAlert to receive daily or hourly updates about current conditions in rivers, lakes, and groundwater when they match conditions of concern to you.
Send an email or text message to WaterNow@usgs.gov containing a USGS current-conditions gaging site number and quickly receive a reply with its most recent observation(s). Get more information about USGS WaterNow.