USGS Streamgage 12035450
Big Creek near Grisdale, WA
Big Creek near Grisdale, WA is USGS streamgage 12035450 in Washington, monitoring river discharge in hydrologic subbasin 17100104. It drains a watershed of about 10 square miles. Discharge records at this site go back to 1972. Typical flow runs near 20.4 cfs in July and 80.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 10 sq mi
- Gauge elevation
- 601 ft
- Subbasin (HUC-8)
- 17100104
- Coordinates
- 47.37426, -123.63684
- USGS site number
- 12035450
- Records begin
- 1972-07-25 (54 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 25 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 | 48.6 | 125.3 | 490.7 | |
| February | 49.1 | 130.5 | 526 | |
| March | 47.7 | 105.5 | 334.8 | |
| April | 39.4 | 80.5 | 235 | |
| May | 28.4 | 47.7 | 133.3 | |
| June | 17.3 | 34.2 | 82.5 | |
| July | 13.7 | 20.4 | 49.9 | |
| August | 10.4 | 13.4 | 35.5 | |
| September | 9.8 | 16.7 | 84.6 | |
| October | 11.3 | 37.4 | 218.9 | |
| November | 37.6 | 141.7 | 498 | |
| December | 52.5 | 141.3 | 614.9 |
All values in cubic feet per second (cfs).