Illinois River
River in Illinois, read from 6 USGS gauges, draining about 26,743 square miles. Figures refresh every fifteen minutes.
Discharge
30,200
cfs · 18 min ago
Normal for today
7,440
cfs median, 88 yrs
Water temp
—
not measured here
Gage height
8.04
ft
Gauges on this water
Reading by reach
Reading the number
On this date the gauge has averaged 7,440 cfs over 88 years of record, with the middle half of years falling between 5,940 and 14,700 cfs. Today is above that band, so expect more push and colour than a typical October day here.
Regional hatch calendar
What is likely hatching near Illinois River
Illinois River does not have its own verified chart yet. This calendar is combined from the verified charts on Black Earth Creek (140 mi). Treat it as regional timing, and file a report if you see something different here.
| Insect | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Blue-Winged Olive | January: absent | February: absent | March: active | April: peak | May: active | June: active | July: active | August: active | September: peak | October: peak | November: absent | December: absent |
| Caddis | January: absent | February: absent | March: absent | April: active | May: peak | June: peak | July: active | August: active | September: active | October: absent | November: absent | December: absent |
| Hendrickson | January: absent | February: absent | March: absent | April: peak | May: active | June: absent | July: absent | August: absent | September: absent | October: absent | November: absent | December: absent |
| Light Cahill | January: absent | February: absent | March: absent | April: absent | May: absent | June: peak | July: active | August: active | September: absent | October: absent | November: absent | December: absent |
| March Brown | January: absent | February: absent | March: absent | April: absent | May: active | June: peak | July: active | August: absent | September: absent | October: absent | November: absent | December: absent |
| Midge | January: peak | February: peak | March: active | April: absent | May: absent | June: absent | July: absent | August: absent | September: absent | October: active | November: active | December: peak |
| Scud | January: active | February: active | March: active | April: active | May: active | June: active | July: active | August: active | September: active | October: active | November: active | December: active |
| Sulphur | January: absent | February: absent | March: absent | April: absent | May: peak | June: peak | July: active | August: absent | September: absent | October: absent | November: absent | December: absent |
| Terrestrials | January: absent | February: absent | March: absent | April: absent | May: absent | June: active | July: peak | August: peak | September: active | October: absent | November: absent | December: absent |
| Trico | January: absent | February: absent | March: absent | April: absent | May: absent | June: absent | July: active | August: peak | September: peak | October: active | November: absent | December: absent |
Reports
From anglers on Illinois River
No reports filed here yet. The first one becomes the page’s local knowledge, stamped with the flow at the time. File a report.