Rivermatics

USGS Streamgage 12149000

Snoqualmie River near Carnation, WA

Snoqualmie River near Carnation, WA is USGS streamgage 12149000 in Washington, monitoring river discharge in hydrologic subbasin 17110010. It sits on the Snoqualmie River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 603 square miles. Discharge records at this site go back to 1929. Typical flow runs near 1,773.5 cfs in July and 3,863 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
603 sq mi
Gauge elevation
48 ft
Subbasin (HUC-8)
17110010
Coordinates
47.66593, -121.9254
USGS site number
12149000
Records begin
1929-03-01 (97 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Snoqualmie River near Carnation, 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
478 496 513
469 493 521
542 690 1,113
648 971 1,597
628 876 1,327
578 738 1,039
529 649 899
498 601 816
481 575 755
460 546 703
451 534 683
439 521 667
426 506 634
420 501 634

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 96 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 1,795.5 3,749.4 10,424.5
February 1,792.1 3,230.7 8,021
March 1,924.5 3,211 6,466.1
April 2,432.7 3,863 6,658.7
May 2,816.5 4,597.7 7,620.6
June 2,099.7 3,913 7,326.3
July 1,049.6 1,773.5 4,007.4
August 589.8 858.8 1,779.7
September 519.4 847.8 2,591
October 653.3 1,679.5 5,635.5
November 1,394.5 3,547 9,813.7
December 1,845.5 3,929 10,132.3

All values in cubic feet per second (cfs).

Common questions

When does Snoqualmie River near Carnation, WA normally run highest?
May, on the long-term record. The median daily flow that month is about 4,597.7 cfs, against 847.8 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 Snoqualmie River near Carnation, WA?
It depends on the month. In January, half of days historically fall near 3,749.4 cfs, with the middle 80% of days between 1,795.5 and 10,424.5 cfs. The month-by-month table on this page gives the full range.
How long has Snoqualmie River near Carnation, WA been measured?
Discharge records at USGS site 12149000 begin in 1929, about 97 years, covering roughly 9,199 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Snoqualmie River near Carnation, 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 Snoqualmie River near Carnation, WA?
The gauge sits at 47.66593, -121.9254, in Washington, in hydrologic subbasin 17110010, at an elevation of about 48 feet, draining roughly 603 square miles.
Can I use Snoqualmie River near Carnation, 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 Snoqualmie River

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

Other gauges in this subbasin