USGS Streamgage 14306950
Siuslaw River near Alma, OR
Siuslaw River near Alma, OR is USGS streamgage 14306950 in Oregon, monitoring river discharge in hydrologic subbasin 17100206. It sits on the Siuslaw River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 157 square miles. Discharge records at this site go back to 2024. 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
- Oregon
- Drainage area
- 157 sq mi
- Subbasin (HUC-8)
- 17100206
- Coordinates
- 43.92114, -123.61158
- USGS site number
- 14306950
- Records begin
- 2024-09-26 (2 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for Siuslaw River near Alma, OR. 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 |
|---|---|---|---|---|
| 24.8 | 26 | 27.4 | ||
| 23.4 | 25.4 | 29.6 | ||
| 23 | 26.1 | 35.1 | ||
| 22.2 | 25.8 | 35.5 | ||
| 21.2 | 24.6 | 33.4 | ||
| 20.2 | 23.5 | 31.7 | ||
| 19.1 | 22.5 | 30.4 | ||
| 18.2 | 21.7 | 29.6 | ||
| 17.9 | 21.5 | 29.4 | ||
| 17.6 | 21.3 | 29.5 | ||
| 17.1 | 20.9 | 29.3 | ||
| 16.7 | 20.5 | 29.2 | ||
| 16.3 | 20.2 | 29.1 | ||
| 16.3 | 20.3 | 29.4 |
All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.
Common questions
- How long has Siuslaw River near Alma, OR been measured?
- Discharge records at USGS site 14306950 begin in 2024, about 2 years, covering roughly 678 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Siuslaw River near Alma, OR?
- 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 Siuslaw River near Alma, OR?
- The gauge sits at 43.92114, -123.61158, in Oregon, in hydrologic subbasin 17100206, draining roughly 157 square miles.
- Can I use Siuslaw River near Alma, OR 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 Siuslaw River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Siuslaw River in full.
- Siuslaw River near Alma, OR this page
- Siuslaw River near Mapleton, OR 588 sq mi