USGS Streamgage 12445000
Okanogan River near Tonasket, WA
Okanogan River near Tonasket, WA is USGS streamgage 12445000 in Washington, monitoring river discharge in hydrologic subbasin 17020006. It drains a watershed of about 7,260 square miles. Discharge records at this site go back to 1929. Typical flow runs near 2,946.8 cfs in July and 2,523 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 7,260 sq mi
- Gauge elevation
- 869 ft
- Subbasin (HUC-8)
- 17020006
- Coordinates
- 48.63238, -119.46172
- USGS site number
- 12445000
- Records begin
- 1929-05-01 (97 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 97 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 | 580.3 | 1,112.9 | 1,858.4 | |
| February | 640.9 | 1,195.2 | 2,171.7 | |
| March | 640.9 | 1,249.7 | 2,450.6 | |
| April | 1,067.1 | 2,523 | 4,934 | |
| May | 3,892.9 | 7,922.9 | 14,908.1 | |
| June | 3,662 | 8,638 | 15,930 | |
| July | 1,296.7 | 2,946.8 | 7,172.9 | |
| August | 509.6 | 1,101.3 | 2,747.7 | |
| September | 482.6 | 933.1 | 1,899.3 | |
| October | 657.4 | 1,079.2 | 1,783.2 | |
| November | 734.7 | 1,274.7 | 2,515.7 | |
| December | 637.6 | 1,144.2 | 2,293.9 |
All values in cubic feet per second (cfs).