ILLINOIS FLOW REPORT

Last Updated: December 28, 2025

Illinois streamflow conditions exhibit considerable variability across the state, highlighting a mix of lower-than-average flows in many rivers, which water enthusiasts should be mindful of when planning activities. Notably, rivers such as the Embarras River at Lawrenceville, the Little Wabash at Carmi, and the Iroquois River near Chebanse are experiencing significantly lower streamflows than normal, with decreases over 90% compared to typical values, indicating potential flow droughts that could affect recreational river use and local ecosystems. Conversely, the Kaskaskia River at Shelbyville is one of the few rivers reporting above-average streamflows (22.2% higher than normal), which could entice kayakers looking for more vigorous conditions. Major rivers like the Mississippi at Chester and Thebes, and the Illinois River at various points, also show reduced streamflows, with the latter seeing a near 47% drop at Marseilles, which may impact larger vessels and river traffic.

The decline in streamflow is also reflected in gage heights with the Rock River at Byron, the Kishwaukee River near Perryville, and the Green River near Geneseo reporting significant streamflow changes in the last 24 hours, signaling dynamic conditions that need close monitoring for any signs of sudden increases that could indicate flooding. The largest streamflow increase has been seen in the Green River near Geneseo, with a 50.41 cfs rise, although it remains well below normal flow levels. Water enthusiasts and residents in affected areas should remain vigilant, especially in the vicinity of larger water systems like the Mississippi and Illinois Rivers, which have wide-reaching impacts on multiple communities and recreational hotspots. Popular whitewater trails may see lower-than-desired conditions, potentially altering seasonal trends of use and accessibility.