USGS Streamgage 06479525
Big Sioux River near Castlewood, SD
Big Sioux River near Castlewood, SD is USGS streamgage 06479525, monitoring river discharge in hydrologic subbasin 10170201. It drains a watershed of about 1,096 square miles. Discharge records at this site go back to 1976. Typical flow runs near 56.9 cfs in July and 156.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- Drainage area
- 1,096 sq mi
- Gauge elevation
- 1,685 ft
- Subbasin (HUC-8)
- 10170201
- Coordinates
- 44.73155, -97.04465
- USGS site number
- 06479525
- Records begin
- 1976-10-01 (50 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 50 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 | 0.1 | 10.2 | 52.9 | |
| February | 0.3 | 14.7 | 84.3 | |
| March | 4.1 | 59.7 | 519.1 | |
| April | 14.6 | 156.3 | 1,183.9 | |
| May | 9.3 | 130 | 621.1 | |
| June | 8.5 | 100.7 | 412 | |
| July | 6.4 | 56.9 | 330 | |
| August | 4.5 | 37.2 | 250.3 | |
| September | 4 | 25.3 | 177.2 | |
| October | 4.9 | 22.7 | 138.8 | |
| November | 5.5 | 23.5 | 120.9 | |
| December | 3.1 | 17.5 | 74.4 |
All values in cubic feet per second (cfs).
Other gauges in this subbasin
- Big Sioux River near Florence, SD
- Big Sioux River near Watertown, SD
- Lake Kampeska at Water Plant at Watertown, SD
- Big Sioux River at Lake Kampeska near Watertown, SD
- Mud Creek near Rauville, SD
- South Branch Tributary Mud Creek near Rauville, SD
- Big Sioux River at Watertown, SD
- Big Sioux River at Broadway at Watertown, SD