USGS Streamgage 12456500
Chiwawa River near Plain, WA
Chiwawa River near Plain, WA is USGS streamgage 12456500 in Washington, monitoring river discharge in hydrologic subbasin 17020011. It drains a watershed of about 170 square miles. Discharge records at this site go back to 1911. Typical flow runs near 657.5 cfs in July and 570 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 170 sq mi
- Gauge elevation
- 2,120 ft
- Subbasin (HUC-8)
- 17020011
- Coordinates
- 47.83731, -120.66229
- USGS site number
- 12456500
- Records begin
- 1911-05-29 (115 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 115 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 | 81.4 | 137.4 | 300.9 | |
| February | 75.6 | 134.2 | 331.9 | |
| March | 95.8 | 170.4 | 434.7 | |
| April | 251.3 | 570 | 1,112 | |
| May | 810.3 | 1,423.5 | 2,683.9 | |
| June | 707.6 | 1,426.3 | 2,452.3 | |
| July | 282.5 | 657.5 | 1,434.6 | |
| August | 119.9 | 208.2 | 466.6 | |
| September | 83.5 | 126.7 | 241.6 | |
| October | 80.2 | 131.7 | 312.1 | |
| November | 92.8 | 180.1 | 522.3 | |
| December | 88.5 | 153.5 | 367.8 |
All values in cubic feet per second (cfs).