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).
Common questions
- When does Big Creek near Grisdale, WA normally run highest?
- November, on the long-term record. The median daily flow that month is about 141.7 cfs, against 13.4 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Big Creek near Grisdale, WA?
- It depends on the month. In January, half of days historically fall near 125.3 cfs, with the middle 80% of days between 48.6 and 490.7 cfs. The month-by-month table on this page gives the full range.
- How long has Big Creek near Grisdale, WA been measured?
- Discharge records at USGS site 12035450 begin in 1972, about 54 years, covering roughly 2,046 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Big Creek near Grisdale, WA?
- The gauge sits at 47.37426, -123.63684, in Washington, in hydrologic subbasin 17100104, at an elevation of about 601 feet, draining roughly 10 square miles.
- Can I use Big Creek near Grisdale, WA data for flood or safety decisions?
- No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.