Illinois HUC8 11110103
A 4,283 km² sub-basin of the Arkansas-White-Red region in AR, OK. Drought coverage is from the US Drought Monitor (map of 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
61
Moderate
Drought index
276
Severe
Area in D2+
50.08%
0% exceptional (D4)
Gauges below normal
19%
of 16 reporting
Median flow
91%
p41 of record
Water assets
3,403
206 springs · 543 wells
USGS gauges (17)
- Flint Creek at Springtown, AR071958002 cfsp8 · much below normal
- Flint Creek near West Siloam Springs, OK071958554 cfsp9 · much below normal
- Caney Creek near Barber, OK0719736011 cfsp25 · below normal
- Illinois River at Chewey, OK07196090224 cfsp28 · normal
- Illinois River near Gore, OK07198000206 cfsp31 · normal
- Osage Creek near Cave Springs, AR0719488020 cfsp34 · normal
- Illinois River near Watts, OK07195500139 cfsp39 · normal
- Baron Fork at Eldon, OK0719700032 cfsp39 · normal
- Flint Creek near Kansas, OK0719600026 cfsp44 · normal
- Baron Fork at Dutch Mills, AR071969001 cfsp46 · normal
- Illinois River near Tahlequah, OK07196500233 cfsp56 · normal
- Osage Creek near Elm Springs, AR0719500083 cfsp58 · normal
- Illinois River at Hwy. 16 near Siloam Springs AR07195400224 cfsp59 · normal
- Sager Creek near West Siloam Springs, OK071958658 cfsp60 · normal
- Illinois River at Savoy, AR0719480026 cfsp73 · normal
- Mud Creek near Johnson, AR0719480958 cfsp92 · much above normal
- Illinois River South of Siloam Springs, AR07195430584 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 276 | 50.08 | 3/16 | p41 |
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