Middle Big Sioux HUC8 10170202
A 5,474 km² sub-basin of the Missouri region in MN, 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
70
Moderate
Drought index
171
Moderate
Area in D2+
19.78%
0% exceptional (D4)
Gauges below normal
0%
of 1 reporting
Median flow
66%
p34 of record
Water assets
6,429
6 springs · 5,396 wells
USGS gauges (1)
- BIG SIOUX RIVER NEAR BRUCE, SD0647977066 cfsp34 · normal
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 171 | 19.78 | 0/1 | p34 |
Top water assets
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- 76Dean A Duffwell
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- 76Lawrence F Spildewell
- 76L G Everist Incwell