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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
84
Healthy
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
133%
p69 of record
Water assets
2,445
3 springs · 1,403 wells
USGS gauges (2)
- ILLINOIS RIVER AT VALLEY CITY, IL0558610010,800 cfsp69 · normal
- ILLINOIS RIVER AT MEREDOSIA, IL055855005,790 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 0 | 0 | 0/1 | p69 |
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