Illinois River River Levels

Total streamflow across the Illinois River was last observed at 52,940 cfs, and is expected to yield approximately 105,005 acre-ft of water today; about 71% of normal. Average streamflow for this time of year is 74,952 cfs, with recent peaks last observed on 2015-12-28 when daily discharge volume was observed at 632,800 cfs.

Maximum discharge along the river is currently at the Illinois River At Henry reporting a streamflow rate of 15,700 cfs. This is also the highest stage along the Illinois River, with a gauge stage of 15.56 ft at this location. This river is monitored from 12 different streamgauging stations along the Illinois River, the highest being situated at an altitude of 1,202 ft, the Illinois River Near Kerby.

It was an important trade route for Native American tribes and European explorers, serving as a vital transportation artery for the region. The river's hydrology is heavily managed through a series of reservoirs and dams, including the Dresden, Marseilles, Peoria, and LaGrange Locks and Dams. These structures help to regulate water levels for navigation and flood control. The river is also used for recreational activities such as boating, fishing, and camping, and it supports a variety of agricultural uses in the surrounding areas. In recent years, efforts have been made to improve water quality and protect the ecosystem of the Illinois River.