Rock HUC8 10170204
A 4,364 km² sub-basin of the Missouri region in IA, MN. 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
65
Moderate
Drought index
244
Severe
Area in D2+
50.76%
0% exceptional (D4)
Gauges below normal
0%
of 2 reporting
Median flow
86%
p44 of record
Water assets
4,233
0 springs · 3,123 wells
USGS gauges (2)
- Rock River near Rock Valley, IA0648350086 cfsp42 · normal
- Rock River below Tom Creek at Rock Rapids, IA0648329070 cfsp46 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 244 | 50.76 | 0/2 | p44 |
Top water assets
- 66Post Group Detentionreservoir
- 65Mound Creek North Poolreservoir
- 65Otter Creekriver
- 65Luverne Northreservoir
- 65Rock River Below Tom Creek At Rock Rapids, Iariver
- 65Luverne Westreservoir
- 65Norwegian Creekriver
- 65Kanaranzi Creekriver
- 65Little Rock Riverriver
- 65Snyder Farm Pondreservoir