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Iroquois River in Illinois

River37.2 mi
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Around Iroquois River

5 mi

Public land: USGS PAD-US

About this river

Iroquois River is a 37.2 mile river. Streamflow is measured at the USGS gauge Iroquois River near Chebanse, IL (site 05526000). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.

Typical flow by month

1923 to 2026

Iroquois River typically runs highest in April, at a median 2,150 cfs, and lowest in September, at 110 cfs. The highest flow on record for any single day is 28,500 cfs, in 2018.

Show the numbers
Typical flow by month at Iroquois River near Chebanse, IL, in cfs
MonthTypical (cfs)Usual range (cfs)
January1,020356 to 2,360
February1,290500 to 2,740
March1,9801,020 to 4,010
April2,1501,020 to 4,190
May1,670853 to 3,360
June1,115607 to 2,760
July460227 to 1,230
August175103 to 385
September11063 to 262
October13779 to 486
November390162 to 1,070
December658222 to 1,780

Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 103 years of record. Statistics published by the US Geological Survey for Iroquois River near Chebanse, IL (site 05526000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.

Boat access nearby

One mapped launch sits in the mapped area of Iroquois River. Ramp data comes from the USGS national boat-ramp inventory.

  • Aroma ParkIroquois RiverRestricted

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