USGS Streamgage 12138160
Sultan River below Powerplant near Sultan, WA
Sultan River below Powerplant near Sultan, WA is USGS streamgage 12138160 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 94 square miles. Discharge records at this site go back to 1983. Typical flow runs near 337.5 cfs in July and 639 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
- 94 sq mi
- Gauge elevation
- 305 ft
- Subbasin (HUC-8)
- 17110009
- Coordinates
- 47.90732, -121.8154
- USGS site number
- 12138160
- Records begin
- 1983-10-01 (43 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for Sultan River below Powerplant 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.
| Date | Low p10 | Expected p50 | High p90 | Range |
|---|---|---|---|---|
| 312 | 313 | 319 | ||
| 310 | 313 | 337 | ||
| 310 | 316 | 342 | ||
| 310 | 315 | 333 | ||
| 310 | 315 | 333 | ||
| 309 | 315 | 335 | ||
| 309 | 315 | 346 | ||
| 308 | 315 | 343 | ||
| 308 | 315 | 343 | ||
| 308 | 316 | 347 | ||
| 307 | 316 | 353 | ||
| 307 | 316 | 355 | ||
| 307 | 316 | 354 | ||
| 307 | 316 | 359 |
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 43 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | 388.2 | 1,210.1 | 1,785.8 | |
| February | 361.6 | 852.6 | 1,665.5 | |
| March | 346.4 | 638.4 | 1,613.5 | |
| April | 342.1 | 639 | 1,539.3 | |
| May | 327.8 | 590.1 | 1,384.2 | |
| June | 294.8 | 510.2 | 1,408.7 | |
| July | 208.5 | 337.5 | 871.3 | |
| August | 186.5 | 293.2 | 685.6 | |
| September | 212.8 | 347.3 | 604.1 | |
| October | 244.2 | 521.8 | 1,088.5 | |
| November | 360.9 | 1,310.3 | 1,866 | |
| December | 396.5 | 1,160.2 | 1,757.1 |
All values in cubic feet per second (cfs).
Common questions
- When does Sultan River below Powerplant near Sultan, WA normally run highest?
- November, on the long-term record. The median daily flow that month is about 1,310.3 cfs, against 293.2 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 Sultan River below Powerplant near Sultan, WA?
- It depends on the month. In January, half of days historically fall near 1,210.1 cfs, with the middle 80% of days between 388.2 and 1,785.8 cfs. The month-by-month table on this page gives the full range.
- How long has Sultan River below Powerplant near Sultan, WA been measured?
- Discharge records at USGS site 12138160 begin in 1983, about 43 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 Sultan River below Powerplant 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 Powerplant near Sultan, WA?
- The gauge sits at 47.90732, -121.8154, in Washington, in hydrologic subbasin 17110009, at an elevation of about 305 feet, draining roughly 94 square miles.
- Can I use Sultan River below Powerplant 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.
- Sultan River below Diversion Dam near Sultan, WA 77 sq mi
- Sultan River below Powerplant near Sultan, WA this page