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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
54
Moderate
Drought index
366
Extreme
Area in D2+
100%
11.55% exceptional (D4)
Gauges below normal
25%
of 16 reporting
Median flow
88%
p39 of record
Water assets
3,403
206 springs · 543 wells
USGS gauges (17)
- Flint Creek near West Siloam Springs, OK071958553 cfsp5 · much below normal
- Flint Creek at Springtown, AR071958003 cfsp9 · much below normal
- Illinois River near Gore, OK0719800065 cfsp15 · below normal
- Caney Creek near Barber, OK0719736013 cfsp20 · below normal
- Illinois River at Chewey, OK07196090247 cfsp30 · normal
- Flint Creek near Kansas, OK0719600028 cfsp33 · normal
- Baron Fork at Eldon, OK0719700039 cfsp34 · normal
- Baron Fork at Dutch Mills, AR071969002 cfsp38 · normal
- Osage Creek near Cave Springs, AR0719488027 cfsp40 · normal
- Mud Creek near Johnson, AR0719480954 cfsp48 · normal
- Illinois River at Savoy, AR0719480026 cfsp51 · normal
- Illinois River near Watts, OK07195500206 cfsp53 · normal
- Sager Creek near West Siloam Springs, OK071958659 cfsp53 · normal
- Illinois River at Hwy. 16 near Siloam Springs AR07195400248 cfsp59 · normal
- Illinois River near Tahlequah, OK07196500314 cfsp60 · normal
- Osage Creek near Elm Springs, AR0719500097 cfsp67 · normal
- Illinois River South of Siloam Springs, AR07195430584 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-20 | 366 | 100 | 4/16 | p39 |
| 2026-10-19 | 366 | 100 | 3/16 | p50 |
| 2026-10-18 | 366 | 100 | 4/16 | p50 |
| 2026-10-17 | 366 | 100 | 4/16 | p55 |
| 2026-10-16 | 366 | 100 | 4/16 | p58 |
| 2026-10-15 | 366 | 100 | 2/16 | p57 |
| 2026-10-14 | 366 | 100 | 6/16 | p31 |
| 2026-10-13 | 366 | 100 | 5/16 | p31 |
| 2026-10-12 | 366 | 100 | 5/16 | p38 |
| 2026-10-11 | 366 | 100 | 5/16 | p35 |
| 2026-10-10 | 366 | 100 | 4/16 | p37 |
| 2026-10-09 | 366 | 100 | 3/16 | p39 |
| 2026-10-08 | 366 | 100 | 4/16 | p45 |
| 2026-10-07 | 366 | 100 | 4/16 | p46 |
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