Hat HUC8 10120108
A 2,507 km² sub-basin of the Missouri region in NE, SD, WY. 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
37
Stressed
Drought index
400
Exceptional
Area in D2+
100%
0% exceptional (D4)
Gauges below normal
100%
of 1 reporting
Median flow
—
p10 of record
Water assets
1,533
0 springs · 155 wells
USGS gauges (1)
- HAT CREEK NEAR EDGEMONT, SD064000000 cfsp10 · below normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 400 | 100 | 1/1 | p10 |
Top water assets
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