Upper Rock HUC8 07090001
A 4,903 km² sub-basin of the Upper Mississippi region in 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
70
Moderate
Drought index
102
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
20%
of 5 reporting
Median flow
174%
p70 of record
Water assets
3,490
6 springs · 2,524 wells
USGS gauges (7)
- ROCK RIVER AT HORICON, WI0542405719 cfsp21 · below normal
- BEAVERDAM RIVER AT BEAVER DAM, WI0542591228 cfsp56 · normal
- CRAWFISH RIVER AT MILFORD, WI05426000207 cfsp70 · normal
- SOUTH BRANCH ROCK RIVER AT WAUPUN, WI0542350018 cfsp77 · above normal
- ROCK RIVER AT WATERTOWN, WI05425500424 cfsp82 · above normal
- ROCK RIVER NEAR LEBANON, WI05424157342 cfsno long-term record
- ROCK RIVER AT JEFFERSON, WI05426031373 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 102 | 0 | 1/5 | p70 |
Top water assets
- 65Karsten No. 2reservoir
- 65Peacockreservoir
- 65Hartfordreservoir
- 65Kekoskeereservoir
- 65Lower Watertown Damreservoir
- 65Monchesreservoir
- 65Upper Beaver Damreservoir
- 65Beaver Dam Riverriver
- 65Crawfish Riverriver
- 65Montereyreservoir