USGS Streamgage 12442500
Similkameen River near Nighthawk, WA
Similkameen River near Nighthawk, WA is USGS streamgage 12442500 in Washington, monitoring river discharge in hydrologic subbasin 17020007. It drains a watershed of about 3,550 square miles. Discharge records at this site go back to 1928. Typical flow runs near 2,287.1 cfs in July and 1,806.7 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 3,550 sq mi
- Gauge elevation
- 1,144 ft
- Subbasin (HUC-8)
- 17020007
- Coordinates
- 48.9846, -119.61841
- USGS site number
- 12442500
- Records begin
- 1928-10-01 (98 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 98 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 | 307 | 577.8 | 1,182.9 | |
| February | 336 | 565.9 | 1,295.5 | |
| March | 413.2 | 615.2 | 1,404.8 | |
| April | 693.8 | 1,806.7 | 4,127 | |
| May | 3,498.7 | 7,148.4 | 13,647.4 | |
| June | 3,236.7 | 7,306.3 | 14,205 | |
| July | 1,101.9 | 2,287.1 | 5,572.3 | |
| August | 365.4 | 742.3 | 1,561.3 | |
| September | 274.1 | 492 | 983.1 | |
| October | 323.8 | 549.2 | 1,126.5 | |
| November | 373.3 | 724.5 | 1,836.3 | |
| December | 325.6 | 641.3 | 1,574.5 |
All values in cubic feet per second (cfs).