Illinois River River Levels

Total streamflow across the Illinois River was last observed at 22,133 cfs, and is expected to yield approximately 43,900 acre-ft of water today; about 26% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 86,297 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 Marseilles reporting a streamflow rate of 8,120 cfs. However, the streamgauge with the highest stage along the river is the Illinois River At Henry with a gauge stage of 14.19 ft. 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.