Rivermatics

USGS Streamgage 12141300

Middle Fork Snoqualmie River near Tanner, WA

Middle Fork Snoqualmie River near Tanner, WA is USGS streamgage 12141300 in Washington, monitoring river discharge in hydrologic subbasin 17110010. It drains a watershed of about 154 square miles. Discharge records at this site go back to 1961. Typical flow runs near 676.7 cfs in July and 1,111 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
154 sq mi
Gauge elevation
790 ft
Subbasin (HUC-8)
17110010
Coordinates
47.48591, -121.64786
USGS site number
12141300
Records begin
1961-02-01 (65 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Middle Fork Snoqualmie River near Tanner, 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
95.2 100 105
94.9 101 109
124 196 412
167 309 597
137 202 329
123 158 221
113 137 182
106 126 162
102 119 149
97.5 114 141
94.7 111 136
91.3 107 130
88.6 104 127
86.8 102 124

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 65 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 426 957.9 3,517.4
February 395.9 825.7 2,596.2
March 460.9 848.3 1,960.6
April 673 1,111 2,357.7
May 1,013.4 1,621 3,119.7
June 818 1,550.7 3,015.7
July 375.9 676.7 1,699.4
August 171.7 262 761
September 137.9 254.1 939.6
October 172.2 562.5 2,170.5
November 444.8 1,096 3,569.3
December 451 940.9 3,436.8

All values in cubic feet per second (cfs).

Common questions

When does Middle Fork Snoqualmie River near Tanner, WA normally run highest?
May, on the long-term record. The median daily flow that month is about 1,621 cfs, against 254.1 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 Middle Fork Snoqualmie River near Tanner, WA?
It depends on the month. In January, half of days historically fall near 957.9 cfs, with the middle 80% of days between 426 and 3,517.4 cfs. The month-by-month table on this page gives the full range.
How long has Middle Fork Snoqualmie River near Tanner, WA been measured?
Discharge records at USGS site 12141300 begin in 1961, about 65 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 Middle Fork Snoqualmie River near Tanner, 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 Middle Fork Snoqualmie River near Tanner, WA?
The gauge sits at 47.48591, -121.64786, in Washington, in hydrologic subbasin 17110010, at an elevation of about 790 feet, draining roughly 154 square miles.
Can I use Middle Fork Snoqualmie River near Tanner, 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