Lower Illinois

In the Lower Illinois region, an area encompassing Calhoun, Greene, Jersey, Morgan, Macoupin, Pike, and Scott counties, rivers and groundwater shape the landscape and are impactful to communities. The upcoming report on this region summarizes the results of an investigation into the Lower Illinois WSPR conducted by ISWS. These efforts and other investigations of water supply throughout the state are funded by the Illinois Department of Natural Resources Office of Water Resources (IDNR-OWR). The soon-to-be-released report and accompanying story maps are meant as a launching point for Lower Illinois stakeholders to use in discussions of water supply.

The major hydrologic feature in the region is the confluence of the Illinois and Mississippi Rivers near Grafton in Calhoun County. Surface water from reservoirs, the Illinois and Mississippi Rivers, and groundwater from aquifers along these rivers are the major water supply sources for people, communities, ecosystems, and industry in the Lower Illinois region.

Story Maps

• Regional Water Demands
• Surface Water
• Surface Water Reservoirs 
• Surface Water Studies and Streamflow Characteristics
• Groundwater
• Groundwater Quality
• Risk to Groundwater Supplies

Report

Lower Illinois Assessment of Water Resources for Water Supply