Rivermatics

USGS Streamgage 12439500

Okanogan River at Oroville, WA

Okanogan River at Oroville, WA is USGS streamgage 12439500 in Washington, monitoring river discharge in hydrologic subbasin 17020006. It drains a watershed of about 3,195 square miles. Discharge records at this site go back to 1942. Typical flow runs near 592.5 cfs in July and 635 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead, alongside daily high and low water-temperature forecasts.

View live conditions & forecast →

Gauge details

State
Washington
Drainage area
3,195 sq mi
Gauge elevation
917 ft
Subbasin (HUC-8)
17020006
Coordinates
48.93072, -119.42034
USGS site number
12439500
Records begin
1942-10-01 (84 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Okanogan River at Oroville, WA. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
292 302 313
291 304 318
288 305 326
284 305 334
280 306 342
274 305 360
269 305 376
264 305 379
259 305 382
254 305 386
249 307 398
244 309 404
240 310 410
233 309 408

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 84 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 206.6 376.9 876.1
February 196.9 452 1,070.2
March 138 513.8 1,201.6
April 175 635 1,584.3
May 270 1,094.4 2,431.3
June 195.5 947.8 2,660
July 165.8 592.5 2,205.5
August 191.5 429.2 1,442.9
September 234.1 449.8 916
October 286.5 460.7 732.6
November 236.5 418.4 814.5
December 212.8 361.9 792.7

All values in cubic feet per second (cfs).

Common questions

When does Okanogan River at Oroville, WA normally run highest?
May, on the long-term record. The median daily flow that month is about 1,094.4 cfs, against 361.9 cfs in December, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Okanogan River at Oroville, WA?
It depends on the month. In January, half of days historically fall near 376.9 cfs, with the middle 80% of days between 206.6 and 876.1 cfs. The month-by-month table on this page gives the full range.
How long has Okanogan River at Oroville, WA been measured?
Discharge records at USGS site 12439500 begin in 1942, about 84 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Okanogan River at Oroville, WA?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. A companion model forecasts each day's water-temperature high and low. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Okanogan River at Oroville, WA?
The gauge sits at 48.93072, -119.42034, in Washington, in hydrologic subbasin 17020006, at an elevation of about 917 feet, draining roughly 3,195 square miles.
Can I use Okanogan River at 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.

Other gauges in this subbasin