Grand HUC8 10130303
A 6,208 km² sub-basin of the Missouri region in ND, 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
61
Moderate
Drought index
322
Extreme
Area in D2+
84.84%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
142%
p63 of record
Water assets
3,230
0 springs · 1,743 wells
USGS gauges (2)
- GRAND RIVER AT LITTLE EAGLE, SD0635780085 cfsp63 · normal
- GRAND RIVER NEAR THUNDER HAWK, SD0635760032 cfsno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 322 | 84.84 | 0/1 | p63 |
Top water assets
- 78Lewis Schmidtriver
- 76Betty Parrottriver
- 76Sam Mortensonriver
- 76Terry L. Skrettebergriver
- 76George W Burnsriver
- 76Joe Zorcriver
- 76Mrs. Minnie Simmermanriver
- 76Peter A. Carmichaelwell
- 76T W/Esther Lymanriver
- 76Noel Mitchellriver