Lower Illinois HUC8 07130011
A 5,886 km² sub-basin of the Upper Mississippi region in IL. 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
78
Healthy
Drought index
79
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
157%
p68 of record
Water assets
2,445
3 springs · 1,403 wells
USGS gauges (2)
- ILLINOIS RIVER AT VALLEY CITY, IL0558610012,700 cfsp68 · normal
- ILLINOIS RIVER AT MEREDOSIA, IL055855005,790 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 79 | 0 | 0/1 | p68 |
| 2026-10-20 | 79 | 0 | 0/1 | p66 |
| 2026-10-19 | 79 | 0 | 0/1 | p73 |
| 2026-10-18 | 79 | 0 | 0/1 | p71 |
| 2026-10-17 | 79 | 0 | 0/1 | p65 |
| 2026-10-16 | 79 | 0 | 0/1 | p73 |
| 2026-10-15 | 73 | 0 | 0/1 | p74 |
| 2026-10-14 | 73 | 0 | 0/1 | p82 |
| 2026-10-13 | 73 | 0 | 0/1 | p85 |
| 2026-10-12 | 73 | 0 | 0/1 | p86 |
| 2026-10-11 | 73 | 0 | 0/1 | p86 |
| 2026-10-10 | 73 | 0 | 0/1 | p88 |
| 2026-10-09 | 73 | 0 | 0/1 | p87 |
| 2026-10-08 | 73 | 0 | 0/1 | p88 |
Top water assets
- 66Waverly City Lake Damreservoir
- 66Lake Jacksonville Damreservoir
- 66White Hall Reservoir Damreservoir
- 66Hambaugh- Martin Ws Str 8reservoir
- 66Pelikan-Surgeon-Shapanskireservoir
- 66Ill. Laborers And Contractors Damreservoir
- 66Lake Of Dreams Damreservoir
- 66Nugent-Schpanski 4 Lake Damreservoir
- 66Fitzjarrell Lake Damreservoir
- 66Roegge Pond Damreservoir