Illinois River

Streamflow • Hydrology • Weather

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Illinois River Levels

May 2 2024

378,786 ACRE-FT

Discharge Volume Today
3.0 cfs (0.0%) since yesterday
155.44% of Normal • 12 Streamgauges

Total streamflow across the Illinois River was last observed at 190,971 cfs, and is expected to yield approximately 378,786 acre-ft of water today; about 155% of normal. River levels are high. Average streamflow for this time of year is 122,854 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 Valley City reporting a streamflow rate of 56,100 cfs. However, the streamgauge with the highest stage along the river is the Illinois River At Henry with a gauge stage of 22.4 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.

Last Updated 2024-05-02
Streamflow 190,971.0 cfs
Percent of Normal 155.44%
Maximum 632,800.0 cfs
2015-12-28

About the illinois river


The Illinois River is a 273-mile-long tributary of the Mississippi River that flows through the state of Illinois. 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.

Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Illinois River Near Kerby
USGS 14377100 		701 cfs 4.48 ft -8.49
Illinois River At Savoy
USGS 07194800 		637 cfs 4.62 ft 141.29
Illinois River At Hwy. 16 Near Siloam Springs Ar
USGS 07195400 		1890 cfs 8.59 ft 102.79
Illinois River South Of Siloam Springs
USGS 07195430 		2110 cfs 5.97 ft 104.85
Illinois River Near Watts
USGS 07195500 		2600 cfs 6.18 ft 104.72
Illinois River At Chewey
USGS 07196090 		1900 cfs 5.1 ft 6.74
Illinois River Near Tahlequah
USGS 07196500 		2790 cfs 7.27 ft -20.51
Illinois River Near Gore
USGS 07198000 		7780 cfs 13.72 ft 0
Illinois River At Marseilles
USGS 05543500 		32600 cfs 16.3 ft -23.29
Illinois River At Kingston Mines
USGS 05568500 		38100 cfs 16.83 ft 10.76
Illinois River At Henry
USGS 05558300 		44400 cfs 22.4 ft 1.14
Illinois River At Valley City
USGS 05586100 		56100 cfs 14.59 ft 5.65

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Peak Annual Discharge

Illinois River Maximum Total Discharge

Seasonal Comparison

Illinois River Year Over Year Discharge


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