USGS Streamgage 14305500
Siletz River at Siletz, OR
Siletz River at Siletz, OR is USGS streamgage 14305500 in Oregon, monitoring river discharge in hydrologic subbasin 17100204. It sits on the Siletz River, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 202 square miles. Discharge records at this site go back to 1905. Typical flow runs near 193.9 cfs in July and 1,154.8 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
- Oregon
- Drainage area
- 202 sq mi
- Subbasin (HUC-8)
- 17100204
- Coordinates
- 44.71512, -123.88733
- USGS site number
- 14305500
- Records begin
- 1905-10-01 (121 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for Siletz River at Siletz, 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 |
|---|---|---|---|---|
| 75.1 | 77.8 | 80.2 | ||
| 77.8 | 86.6 | 113 | ||
| 80.9 | 101 | 160 | ||
| 77.9 | 95.4 | 148 | ||
| 73.8 | 86.9 | 119 | ||
| 69.6 | 79.6 | 99.1 | ||
| 66.7 | 75.3 | 89.3 | ||
| 64.9 | 72.9 | 85.2 | ||
| 63.4 | 71.4 | 82.8 | ||
| 61.7 | 69.4 | 79.6 | ||
| 59.7 | 67.5 | 77.4 | ||
| 58.7 | 66.4 | 76.1 | ||
| 57.2 | 65.1 | 75 | ||
| 56.4 | 64.5 | 74.1 |
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 121 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 | 898 | 2,254.2 | 6,942.6 | |
| February | 782.7 | 1,951.7 | 6,043.8 | |
| March | 744.9 | 1,664.8 | 4,444.5 | |
| April | 584.8 | 1,154.8 | 2,769.3 | |
| May | 348.7 | 641.4 | 1,612.3 | |
| June | 192.5 | 361.7 | 918.3 | |
| July | 116.6 | 193.9 | 343.8 | |
| August | 74.1 | 110.6 | 188.8 | |
| September | 64.4 | 99.9 | 384.2 | |
| October | 83.2 | 294.9 | 1,712 | |
| November | 350.1 | 1,525.7 | 5,634.3 | |
| December | 793 | 2,271 | 7,141.6 |
All values in cubic feet per second (cfs).
Common questions
- When does Siletz River at Siletz, OR normally run highest?
- December, on the long-term record. The median daily flow that month is about 2,271 cfs, against 99.9 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 Siletz River at Siletz, OR?
- It depends on the month. In January, half of days historically fall near 2,254.2 cfs, with the middle 80% of days between 898 and 6,942.6 cfs. The month-by-month table on this page gives the full range.
- How long has Siletz River at Siletz, OR been measured?
- Discharge records at USGS site 14305500 begin in 1905, about 121 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Siletz River at Siletz, 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 Siletz River at Siletz, OR?
- The gauge sits at 44.71512, -123.88733, in Oregon, in hydrologic subbasin 17100204, draining roughly 202 square miles.
- Can I use Siletz River at Siletz, 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 Siletz River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Siletz River in full.
- Siletz River at Siletz, OR this page
- Siletz River near Siletz, OR