USGS Streamgage 06485950
Big Sioux River at Sioux City, IA
Big Sioux River at Sioux City, IA is USGS streamgage 06485950, monitoring river discharge in hydrologic subbasin 10170203. It drains a watershed of about 8,430 square miles. Discharge records at this site go back to 2015. Typical flow runs near 2,477.4 cfs in July and 3,299 cfs in April, with the higher of the two arriving in April.
Gauge details
- Drainage area
- 8,430 sq mi
- Gauge elevation
- 1,073 ft
- Subbasin (HUC-8)
- 10170203
- Coordinates
- 42.52443, -96.48051
- USGS site number
- 06485950
- Records begin
- 2015-03-01 (11 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 11 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 | 221.3 | 953.9 | 3,191 | |
| February | 242.6 | 974.2 | 3,559.6 | |
| March | 559.1 | 1,819.8 | 18,361.3 | |
| April | 948.3 | 3,299 | 17,266.7 | |
| May | 1,186.8 | 4,357.4 | 14,745.2 | |
| June | 1,004.2 | 3,603.3 | 24,690 | |
| July | 617.4 | 2,477.4 | 12,089 | |
| August | 475.1 | 1,348.7 | 5,053.9 | |
| September | 230.4 | 1,259.3 | 14,462.7 | |
| October | 274.2 | 1,006.9 | 9,692.3 | |
| November | 306.7 | 1,336.7 | 6,925.7 | |
| December | 293.9 | 1,344.8 | 3,835.2 |
All values in cubic feet per second (cfs).