USGS Streamgage 06481000
Big Sioux River near Dell Rapids, SD
Big Sioux River near Dell Rapids, SD is USGS streamgage 06481000, monitoring river discharge in hydrologic subbasin 10170203. It drains a watershed of about 3,927 square miles. Discharge records at this site go back to 1948. Typical flow runs near 257.4 cfs in July and 619.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- Drainage area
- 3,927 sq mi
- Gauge elevation
- 1,463 ft
- Subbasin (HUC-8)
- 10170203
- Coordinates
- 43.79047, -96.74533
- USGS site number
- 06481000
- Records begin
- 1948-05-01 (78 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 78 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 5.6 | 33.2 | 225.9 | |
| February | 5.1 | 40.2 | 375.3 | |
| March | 31.1 | 326.8 | 2,173.6 | |
| April | 118.9 | 619.8 | 4,453.7 | |
| May | 81.6 | 521.5 | 2,396.1 | |
| June | 52.9 | 434.3 | 2,208.7 | |
| July | 33.5 | 257.4 | 1,641.9 | |
| August | 18.3 | 132.8 | 1,020.5 | |
| September | 14.9 | 91.5 | 707.5 | |
| October | 16 | 98.3 | 738.8 | |
| November | 20.1 | 89.5 | 586.3 | |
| December | 12 | 64.1 | 368.2 |
All values in cubic feet per second (cfs).