Lower Rock HUC8 07090005
A 5,617 km² sub-basin of the Upper Mississippi region in IL, WI. 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
82
Healthy
Drought index
32
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 7 reporting
Median flow
102%
p51 of record
Water assets
2,545
7 springs · 1,308 wells
USGS gauges (7)
- ROCK RIVER AT DIXON, IL054423003,330 cfsp25 · normal
- ROCK RIVER AT BYRON, IL054407003,370 cfsp34 · normal
- ELKHORN CREEK NEAR PENROSE, IL0544400045 cfsp47 · normal
- ROCK RIVER NEAR JOSLIN, IL054465003,610 cfsp51 · normal
- ROCK RIVER AT COMO, IL054435003,590 cfsp57 · normal
- ROCK RIVER AT ROCKTON, IL054375003,180 cfsp67 · normal
- MILL CREEK AT MILAN, IL054480009 cfsp71 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 32 | 0 | 0/7 | p51 |
Top water assets
- 66Page Park Damreservoir
- 66Pierce Lake Damreservoir
- 66Stanrick Damreservoir
- 66Alpine Damreservoir
- 66Lake Carlton Damreservoir
- 65Rock Riverriver
- 65Elkhorn Creekriver
- 65Kyte Riverriver
- 65Rock Riverriver
- 65Fivemile Creekriver