South Fork Grand HUC8 10130302
A 4,519 km² sub-basin of the Missouri region in SD. 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
69
Moderate
Drought index
230
Severe
Area in D2+
27.66%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
92%
p44 of record
Water assets
2,499
21 springs · 775 wells
USGS gauges (1)
- SOUTH FORK GRAND RIVER NEAR CASH, SD063565009 cfsp44 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 230 | 27.66 | 0/1 | p44 |
Top water assets
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- 76Waurika Farms Llcwell
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- 76Timothy G/Tracy Brownriver
- 76David/Mary Lou Mollmanriver
- 76Than Brengleriver
- 76Robert W Mosleywell