USGS Streamgage 12035400
Wynoochee River near Grisdale, WA
Wynoochee River near Grisdale, WA is USGS streamgage 12035400 in Washington, monitoring river discharge in hydrologic subbasin 17100104. It drains a watershed of about 41 square miles. Discharge records at this site go back to 1965. Typical flow runs near 231.5 cfs in July and 233.5 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 41 sq mi
- Gauge elevation
- 633 ft
- Subbasin (HUC-8)
- 17100104
- Coordinates
- 47.38034, -123.60986
- USGS site number
- 12035400
- Records begin
- 1965-10-01 (61 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 61 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 | 257.4 | 689.4 | 1,793.9 | |
| February | 232.7 | 482.4 | 1,462.4 | |
| March | 209.3 | 349.5 | 1,206.6 | |
| April | 202.2 | 233.5 | 633.9 | |
| May | 207 | 243.5 | 618.5 | |
| June | 208 | 263.4 | 529.6 | |
| July | 179.2 | 231.5 | 359.4 | |
| August | 159.7 | 218.5 | 288.7 | |
| September | 179.4 | 237.6 | 542.8 | |
| October | 189.8 | 299.3 | 1,059.6 | |
| November | 226.1 | 617.8 | 1,779.7 | |
| December | 258.3 | 698.2 | 1,997.1 |
All values in cubic feet per second (cfs).