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USGS IN YOUR STATE

USGS Water Science Centers are located in each state.

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. USGS WaterAlert 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. USGS WaterNow 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. Quick Link to Real-Time Data: Enter a USGS site number:    View site list: SW | GW | WQ

Illinois Highlights

USGS Measures Record Flooding in Illinois

U.S. Geological Survey field crews are measuring record flooding on rivers and streams across most of Illinois. At least ten USGS streamgages in Illinois that have more than 20 years of record, have measured the highest flood levels ever recorded. More record levels are expected as flooding moves downstream. USGS crews are expected to track the movement of the floodwaters down the Illinois River, the Rock Rivers, and major tributaries over the next few days. Many of the Illinois River floodwaters are expected to exceed records and may result in major flooding that overtop levees. There are 53 USGS streamgages currently at or above flood levels as a result of the rains that began on Tuesday, April 16. Read more.

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Initial Results from a Reconnaissance of Cyanobacteria and Associated Toxins in Illinois, August-October 2012

During the drought of 2012, cyanobacteria was recognized to be a concern in Illinois lakes and rivers. The USGS and the Illinois Environmental Protection Agency completed a reconnaissance data collection effort and have published an Open-File Report summarizing initial results of the currently available data in support of a public meeting. Stay tuned to this website for additional developments.