ILLINOIS FLOW REPORT

Last Updated: December 4, 2025

Illinois river enthusiasts should be aware that the state is currently experiencing a trend towards lower-than-average streamflows across several rivers and watersheds, signaling a period of flow droughts that could impact recreational activities and ecosystems. The Wabash River at Mt. Carmel, an important waterway, reports a current flow of 8620 cubic feet per second (cfs), which is 68.82% below normal. Similarly, the Little Wabash River at Carmi is flowing at a mere 114 cfs, a drastic 96.83% below its average, indicating a significant reduction in water volume. The Illinois River, another major river system, shows varied conditions with the streamflow at Marseilles recorded at 3490 cfs, 64.48% below normal, while at Henry, there's been a notable increase of 130.83 cfs in the past 24 hours, though still 59.66% below normal. These conditions suggest caution for water-based activities and raise concerns over potential ecological impacts.

Specifically, river systems such as the Rock River and the Kankakee River are also experiencing reduced flows, with notable decreases in streamflow change in the past 24 hours. For example, the Rock River at Rockton is flowing at 2820 cfs, a 48.64% decrease from its average flow, and the Kankakee River at Wilmington is at 2240 cfs, 52.77% below normal. These lower flows might affect popular whitewater trails, reducing their navigability and potentially impacting nearby cities and ecosystems. On the other hand, the Kaskaskia River at New Athens has seen a large 24-hour increase of 172.97 cfs, suggesting potential for rising water levels that could lead to flooding concerns. River watchers in these areas should stay informed on current conditions and be prepared for changing water levels that could impact fishing, boating, and other river activities.