Rivermatics

USGS Streamgage 12142000

NF Snoqualmie River near Snoqualmie Falls, WA

NF Snoqualmie River near Snoqualmie Falls, WA is USGS streamgage 12142000 in Washington, monitoring river discharge in hydrologic subbasin 17110010. It drains a watershed of about 64 square miles. Discharge records at this site go back to 1929. Typical flow runs near 220 cfs in July and 494.2 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
64 sq mi
Gauge elevation
1,137 ft
Subbasin (HUC-8)
17110010
Coordinates
47.61483, -121.71344
USGS site number
12142000
Records begin
1929-10-01 (97 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for NF Snoqualmie River near Snoqualmie Falls, 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
36.9 38.7 40.7
35.7 38 41.4
49.5 91.4 230
64.2 134 287
59.1 99.3 179
51.1 72 112
46.1 60.5 89.1
41.7 53 75
39.9 49.7 67.3
37.3 46.2 61.3
35.9 44.2 57.7
34.5 42.3 54.5
33.3 40.6 51.9
32.2 39.3 49.6

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 182.7 421.5 1,554.9
February 167.2 354.8 1,059.4
March 200.3 372.8 943
April 289.1 494.2 1,002.5
May 357.1 643.3 1,206.5
June 261.8 540.3 1,109.4
July 101.7 220 571.5
August 46.8 83.1 245.4
September 44.3 102.8 445.5
October 73.5 240.7 967.1
November 175.6 475.8 1,499.3
December 195.5 432.2 1,524.9

All values in cubic feet per second (cfs).

Common questions

When does NF Snoqualmie River near Snoqualmie Falls, WA normally run highest?
May, on the long-term record. The median daily flow that month is about 643.3 cfs, against 83.1 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for NF Snoqualmie River near Snoqualmie Falls, WA?
It depends on the month. In January, half of days historically fall near 421.5 cfs, with the middle 80% of days between 182.7 and 1,554.9 cfs. The month-by-month table on this page gives the full range.
How long has NF Snoqualmie River near Snoqualmie Falls, WA been measured?
Discharge records at USGS site 12142000 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 NF Snoqualmie River near Snoqualmie Falls, 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 NF Snoqualmie River near Snoqualmie Falls, WA?
The gauge sits at 47.61483, -121.71344, in Washington, in hydrologic subbasin 17110010, at an elevation of about 1,137 feet, draining roughly 64 square miles.
Can I use NF Snoqualmie River near Snoqualmie Falls, 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