Rivermatics

USGS Streamgage 12137800

Sultan River below Diversion Dam near Sultan, WA

Sultan River below Diversion Dam near Sultan, WA is USGS streamgage 12137800 in Washington, monitoring river discharge in hydrologic subbasin 17110009. It sits on the Sultan River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 77 square miles. Discharge records at this site go back to 1983. Typical flow runs near 107.9 cfs in July and 185.8 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, alongside daily high and low water-temperature forecasts.

View live conditions & forecast →

Gauge details

State
Washington
Drainage area
77 sq mi
Gauge elevation
681 ft
Subbasin (HUC-8)
17110009
Coordinates
47.95927, -121.79734
USGS site number
12137800
Records begin
1983-05-01 (43 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Sultan River below Diversion Dam near Sultan, 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
108 109 110
107 109 117
107 110 132
108 110 144
107 111 156
107 111 159
106 111 173
106 112 173
106 112 172
106 113 174
106 114 178
105 115 180
105 115 189
105 116 184

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 44 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 107.2 149.5 304.9
February 112.2 164.5 303
March 139.8 191.5 354.7
April 150.9 185.8 275.2
May 146.5 182.6 256.2
June 120.9 145.5 190.8
July 99.1 107.9 153
August 96.8 109.7 143.4
September 129.1 147.9 220.7
October 158.8 183.8 293.5
November 100.5 141.2 478.1
December 100.7 128.4 329.9

All values in cubic feet per second (cfs).

Common questions

When does Sultan River below Diversion Dam near Sultan, WA normally run highest?
March, on the long-term record. The median daily flow that month is about 191.5 cfs, against 107.9 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Sultan River below Diversion Dam near Sultan, WA?
It depends on the month. In January, half of days historically fall near 149.5 cfs, with the middle 80% of days between 107.2 and 304.9 cfs. The month-by-month table on this page gives the full range.
How long has Sultan River below Diversion Dam near Sultan, WA been measured?
Discharge records at USGS site 12137800 begin in 1983, about 43 years, covering roughly 9,140 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Sultan River below Diversion Dam near Sultan, 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. A companion model forecasts each day's water-temperature high and low. 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 Sultan River below Diversion Dam near Sultan, WA?
The gauge sits at 47.95927, -121.79734, in Washington, in hydrologic subbasin 17110009, at an elevation of about 681 feet, draining roughly 77 square miles.
Can I use Sultan River below Diversion Dam near Sultan, 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 Sultan River

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

Other gauges in this subbasin