USGS Streamgage 12443500
Similkameen River near Oroville, WA
Similkameen River near Oroville, WA is USGS streamgage 12443500 in Washington, monitoring river discharge in hydrologic subbasin 17020007. It sits on the Similkameen River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 3,580 square miles. Discharge records at this site go back to 1911. Typical flow runs near 2,486.8 cfs in July and 1,521.9 cfs in April, with the higher of the two arriving in July.
Gauge details
- State
- Washington
- Drainage area
- 3,580 sq mi
- Gauge elevation
- 1,199 ft
- Subbasin (HUC-8)
- 17020007
- Coordinates
- 48.96099, -119.50118
- USGS site number
- 12443500
- Records begin
- 1911-06-01 (115 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 18 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 | 312.1 | 505.4 | 1,359 | |
| February | 356.2 | 530 | 1,066.6 | |
| March | 380.5 | 528.5 | 1,053.3 | |
| April | 532.9 | 1,521.9 | 3,243 | |
| May | 3,044.8 | 7,079.7 | 13,877.4 | |
| June | 2,776.7 | 8,039 | 14,384.3 | |
| July | 1,084.1 | 2,486.8 | 4,962.6 | |
| August | 360.8 | 796.7 | 1,222.7 | |
| September | 226.6 | 483.5 | 1,085 | |
| October | 371.7 | 581.1 | 1,699.7 | |
| November | 415 | 620.3 | 1,477.3 | |
| December | 368.3 | 522.4 | 1,354.1 |
All values in cubic feet per second (cfs).
Common questions
- When does Similkameen River near Oroville, WA normally run highest?
- June, on the long-term record. The median daily flow that month is about 8,039 cfs, against 483.5 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Similkameen River near Oroville, WA?
- It depends on the month. In January, half of days historically fall near 505.4 cfs, with the middle 80% of days between 312.1 and 1,359 cfs. The month-by-month table on this page gives the full range.
- How long has Similkameen River near Oroville, WA been measured?
- Discharge records at USGS site 12443500 begin in 1911, about 115 years. The long record is what makes the monthly percentiles on this page meaningful.
- Where is Similkameen River near Oroville, WA?
- The gauge sits at 48.96099, -119.50118, in Washington, in hydrologic subbasin 17020007, at an elevation of about 1,199 feet, draining roughly 3,580 square miles.
- Can I use Similkameen River near Oroville, 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.
Upstream and downstream on the Similkameen River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Similkameen River in full.
- Similkameen River near Nighthawk, WA 3,550 sq mi
- Similkameen River near Oroville, WA this page