Rivermatics

USGS Streamgage 12097500

Greenwater River at Greenwater, WA

Greenwater River at Greenwater, WA is USGS streamgage 12097500 in Washington, monitoring river discharge in hydrologic subbasin 17110014. It drains a watershed of about 74 square miles. Discharge records at this site go back to 1911. Typical flow runs near 115.5 cfs in July and 254.2 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.

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Gauge details

State
Washington
Drainage area
74 sq mi
Gauge elevation
1,741 ft
Subbasin (HUC-8)
17110014
Coordinates
47.15344, -121.63565
USGS site number
12097500
Records begin
1911-10-01 (115 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Greenwater River at Greenwater, 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
28.8 29.7 30.5
29.1 30.8 33.5
34.4 46.6 79.3
33.6 42.8 63.5
32.4 38.7 51.1
30.7 35.1 43
29.3 33 38.9
28.4 31.8 36.8
27.8 31 35.6
27.2 30.2 34.5
26.7 29.7 33.9
26.2 29.3 33.2
25.8 28.9 32.8
25.4 28.6 32.5

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 79 188.2 498.5
February 84.5 171 430.8
March 94.2 167.6 361.8
April 141.2 254.2 471.7
May 215.5 380.9 687.4
June 136 301.5 610.2
July 68.1 115.5 263.6
August 40 57.8 94.5
September 31.7 44.5 68.4
October 30.9 49.4 131.6
November 43 111.8 391
December 65.1 169.5 501.2

All values in cubic feet per second (cfs).

Common questions

When does Greenwater River at Greenwater, WA normally run highest?
May, on the long-term record. The median daily flow that month is about 380.9 cfs, against 44.5 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 Greenwater River at Greenwater, WA?
It depends on the month. In January, half of days historically fall near 188.2 cfs, with the middle 80% of days between 79 and 498.5 cfs. The month-by-month table on this page gives the full range.
How long has Greenwater River at Greenwater, WA been measured?
Discharge records at USGS site 12097500 begin in 1911, about 115 years, covering roughly 9,196 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Greenwater River at Greenwater, 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 Greenwater River at Greenwater, WA?
The gauge sits at 47.15344, -121.63565, in Washington, in hydrologic subbasin 17110014, at an elevation of about 1,741 feet, draining roughly 74 square miles.
Can I use Greenwater River at Greenwater, 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