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 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
58
Moderate
Drought index
269
Severe
Area in D2+
56.94%
0% exceptional (D4)
Gauges below normal
27%
of 11 reporting
Median flow
82%
p42 of record
Water assets
9,821
6 springs · 7,200 wells
USGS gauges (12)
- BIG SIOUX RIVER NEAR HAWARDEN, IA06483950278 cfsp14 · below normal
- BIG SIOUX RIVER NEAR JEFFERSON, SD06485910451 cfsp15 · below normal
- SPLIT ROCK CREEK AT CORSON, SD064826107 cfsp21 · below normal
- SKUNK CREEK AT SIOUX FALLS, SD064815003 cfsp28 · normal
- BIG SIOUX R AT NORTH CLIFF AVE AT SIOUX FALLS, SD06482020135 cfsp36 · normal
- BIG SIOUX RIVER AT SIOUX FALLS, SD0648200068 cfsp42 · normal
- FLANDREAU CREEK ABOVE FLANDREAU, SD064806505 cfsp45 · normal
- SKUNK CREEK NEAR CHESTER, SD064814802 cfsp46 · normal
- BIG SIOUX RIVER AT AKRON, IA06485500409 cfsp51 · normal
- BIG SIOUX RIVER NEAR BROOKINGS, SD0648000082 cfsp51 · normal
- BIG SIOUX RIVER NEAR DELL RAPIDS, SD06481000147 cfsp55 · normal
- BIG SIOUX RIVER AT SIOUX CITY, IA06485950no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 269 | 56.94 | 3/11 | p42 |
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