Lower Big Sioux HUC8 10170203
A 8,855 km² sub-basin of the Missouri region in IA, MN, NE, SD. Drought coverage is from the US Drought Monitor (map of 2026-10-13); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
71
Moderate
Drought index
127
Moderate
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
9%
of 11 reporting
Median flow
88%
p45 of record
Water assets
9,821
6 springs · 7,200 wells
USGS gauges (12)
- SKUNK CREEK NEAR CHESTER, SD064814800 cfsp3 · much below normal
- SKUNK CREEK AT SIOUX FALLS, SD064815003 cfsp26 · normal
- SPLIT ROCK CREEK AT CORSON, SD0648261018 cfsp31 · normal
- BIG SIOUX RIVER NEAR HAWARDEN, IA06483950637 cfsp42 · normal
- BIG SIOUX R AT NORTH CLIFF AVE AT SIOUX FALLS, SD06482020158 cfsp44 · normal
- FLANDREAU CREEK ABOVE FLANDREAU, SD0648065011 cfsp45 · normal
- BIG SIOUX RIVER NEAR JEFFERSON, SD06485910840 cfsp50 · normal
- BIG SIOUX RIVER AT SIOUX FALLS, SD0648200075 cfsp51 · normal
- BIG SIOUX RIVER NEAR DELL RAPIDS, SD06481000115 cfsp52 · normal
- BIG SIOUX RIVER NEAR BROOKINGS, SD0648000097 cfsp53 · normal
- BIG SIOUX RIVER AT AKRON, IA06485500808 cfsp75 · above normal
- BIG SIOUX RIVER AT SIOUX CITY, IA06485950no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-10-21 | 127 | 0 | 1/11 | p45 |
| 2026-10-20 | 127 | 0 | 1/11 | p44 |
| 2026-10-19 | 127 | 0 | 1/11 | p50 |
| 2026-10-18 | 127 | 0 | 1/11 | p51 |
| 2026-10-17 | 127 | 0 | 1/11 | p49 |
| 2026-10-16 | 127 | 0 | 1/11 | p51 |
| 2026-10-15 | 127 | 0 | 1/11 | p46 |
| 2026-10-14 | 127 | 0 | 1/11 | p44 |
| 2026-10-13 | 127 | 0 | 1/11 | p49 |
| 2026-10-12 | 127 | 0 | 1/11 | p50 |
| 2026-10-11 | 127 | 0 | 1/11 | p50 |
| 2026-10-10 | 127 | 0 | 1/11 | p50 |
| 2026-10-09 | 127 | 0 | 1/11 | p51 |
| 2026-10-08 | 134 | 0 | 1/11 | p51 |
Top water assets
- 76Lyle Wagnerwell
- 76Dept Of Game Fish & Parksriver
- 76City Of Sioux Fallswell
- 76City Of Sioux Fallswell
- 76City Of Sioux Falls Water Divisionwell
- 76L G Everist Incwell
- 76Northern States Power Coriver
- 76Bryson R Mchardyriver
- 76William F Bundewell
- 76Dale And Leon Kittelsonriver