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 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
80
Healthy
Drought index
0
None
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 7 reporting
Median flow
173%
p79 of record
Water assets
2,545
7 springs · 1,308 wells
USGS gauges (7)
- ROCK RIVER AT DIXON, IL054423005,910 cfsp66 · normal
- ROCK RIVER AT ROCKTON, IL054375004,520 cfsp76 · above normal
- ROCK RIVER AT BYRON, IL054407005,990 cfsp76 · above normal
- ROCK RIVER NEAR JOSLIN, IL054465007,300 cfsp79 · above normal
- ELKHORN CREEK NEAR PENROSE, IL0544400094 cfsp81 · above normal
- ROCK RIVER AT COMO, IL054435007,220 cfsp81 · above normal
- MILL CREEK AT MILAN, IL0544800038 cfsp89 · above normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 0 | 0 | 0/7 | p79 |
| 2026-10-20 | 0 | 0 | 0/7 | p80 |
| 2026-10-19 | 0 | 0 | 0/7 | p80 |
| 2026-10-18 | 0 | 0 | 0/7 | p81 |
| 2026-10-17 | 0 | 0 | 0/7 | p80 |
| 2026-10-16 | 0 | 0 | 0/7 | p81 |
| 2026-10-15 | 0 | 0 | 0/7 | p81 |
| 2026-10-14 | 0 | 0 | 0/7 | p82 |
| 2026-10-13 | 0 | 0 | 0/7 | p83 |
| 2026-10-12 | 0 | 0 | 0/7 | p83 |
| 2026-10-11 | 0 | 0 | 0/7 | p84 |
| 2026-10-10 | 0 | 0 | 0/7 | p85 |
| 2026-10-09 | 0 | 0 | 0/7 | p85 |
| 2026-10-08 | 0 | 0 | 0/7 | p87 |
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