Rivermatics

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 sits on the Okanogan River, alongside 2 other gauges Rivermatics tracks on the same river. 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. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.

View live conditions & forecast →

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)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Okanogan River near Tonasket, 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
491 511 529
484 507 527
485 513 546
484 513 549
487 518 563
482 516 563
479 515 569
473 511 571
467 505 565
461 501 560
456 497 563
451 493 567
445 489 567
442 486 557

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 97 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 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).

Common questions

When does Okanogan River near Tonasket, WA normally run highest?
June, on the long-term record. The median daily flow that month is about 8,638 cfs, against 933.1 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 Okanogan River near Tonasket, WA?
It depends on the month. In January, half of days historically fall near 1,112.9 cfs, with the middle 80% of days between 580.3 and 1,858.4 cfs. The month-by-month table on this page gives the full range.
How long has Okanogan River near Tonasket, WA been measured?
Discharge records at USGS site 12445000 begin in 1929, about 97 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 near Tonasket, 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. 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 near Tonasket, WA?
The gauge sits at 48.63238, -119.46172, in Washington, in hydrologic subbasin 17020006, at an elevation of about 869 feet, draining roughly 7,260 square miles.
Can I use Okanogan River near Tonasket, 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 Okanogan River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Okanogan River in full.

Other gauges in this subbasin