ILLINOIS FLOW REPORT

Last Updated: December 24, 2025

Illinois waterways are experiencing varied streamflow conditions, with several rivers showing significant deviations from their normal flow patterns. The Wabash River at Mt. Carmel, a major watercourse in the southeastern part of the state, is currently flowing at 12,300 cubic feet per second (cfs), a reduction of 56.46% from its typical rate, which may affect recreational activities and aquatic habitats. In contrast, the Kaskaskia River at Shelbyville saw a significant 24-hour increase of 244.5 cfs, pushing its flow to 751 cfs, 25.2% above normal, warranting attention for possible flooding events around the Shelbyville area. The Rock River, with various measuring points such as near Joslin, at Como, and at Byron, shows streamflows ranging from 4,300 cfs to 6,050 cfs, with notable changes in the last 24 hours, potentially impacting communities along its path, including the whitewater trails near Byron which are popular among enthusiasts.

Further exploration into the data reveals extreme anomalies such as the Little Wabash River at Carmi with a stark 97.33% below normal flow and the Iroquois River near Chebanse at 92.06% below normal, signifying potential flow droughts. These low streamflows could lead to ecological stresses and reduced water availability for nearby towns. Meanwhile, the Des Plaines River, which flows near densely populated areas like Riverside and Des Plaines, shows flow rates of 306 cfs and 121 cfs respectively, both significantly lower than average, potentially affecting water recreation and wildlife. The Fox River, with various gauges from Algonquin to South Elgin, is also experiencing reduced flows, which could impact river-based activities throughout that region. Notably, the Mississippi River at Thebes is flowing at a massive 83,100 cfs though still 52.31% below its normal flow, a factor that could influence shipping and commerce activities. These fluctuations highlight the importance of monitoring streamflow for the management of water resources as well as for the safety and enjoyment of river enthusiasts across Illinois.