USGS Streamgage 12137290
South Fork Sultan River near Sultan, WA
South Fork Sultan River near Sultan, WA is USGS streamgage 12137290 in Washington, monitoring river discharge in hydrologic subbasin 17110009. It drains a watershed of about 12 square miles. Discharge records at this site go back to 1990. Typical flow runs near 42.5 cfs in July and 123 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 12 sq mi
- Gauge elevation
- 1,465 ft
- Subbasin (HUC-8)
- 17110009
- Coordinates
- 47.94733, -121.62678
- USGS site number
- 12137290
- Records begin
- 1990-11-24 (36 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 35 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 | 35.1 | 101.5 | 505.9 | |
| February | 31.5 | 70.9 | 298 | |
| March | 36.8 | 84.4 | 293.8 | |
| April | 61.8 | 123 | 295.4 | |
| May | 74.6 | 156.2 | 333.5 | |
| June | 48.4 | 118.1 | 273.1 | |
| July | 15.6 | 42.5 | 135 | |
| August | 7.5 | 14.6 | 57.6 | |
| September | 7 | 19.5 | 124.6 | |
| October | 14.4 | 70.3 | 359.4 | |
| November | 37.9 | 122.7 | 557.5 | |
| December | 34.6 | 81.3 | 393.9 |
All values in cubic feet per second (cfs).