USGS Streamgage 14171000
Marys River near Philomath, OR
Marys River near Philomath, OR is USGS streamgage 14171000 in Oregon, monitoring river discharge in hydrologic subbasin 17090003. It drains a watershed of about 159 square miles. Discharge records at this site go back to 1940. Typical flow runs near 33.8 cfs in July and 365.4 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
- 159 sq mi
- Subbasin (HUC-8)
- 17090003
- Coordinates
- 44.525, -123.334
- USGS site number
- 14171000
- Records begin
- 1940-10-01 (86 years)
- Rivermatics forecast
- 14-day flow outlook + water temperature
14-day flow forecast
Based on observations through for Marys River near Philomath, 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 |
|---|---|---|---|---|
| 10.5 | 11.4 | 12.5 | ||
| 9.8 | 11.7 | 14.9 | ||
| 9.4 | 11.6 | 15.5 | ||
| 8.7 | 10.8 | 13.9 | ||
| 8 | 10 | 13 | ||
| 7.4 | 9.5 | 12.5 | ||
| 7.2 | 9.1 | 12 | ||
| 6.7 | 8.8 | 11.8 | ||
| 6.4 | 8.5 | 11.4 | ||
| 6.4 | 8.4 | 11.2 | ||
| 6.2 | 8.3 | 11.1 | ||
| 6.2 | 8.3 | 11.4 | ||
| 6.2 | 8.4 | 11.4 | ||
| 6.2 | 8.5 | 11.6 |
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 86 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 | 253.7 | 777.9 | 2,553.5 | |
| February | 250.6 | 667.5 | 2,194.8 | |
| March | 238.1 | 578.3 | 1,628.7 | |
| April | 190.5 | 365.4 | 921.7 | |
| May | 104.6 | 171 | 405.9 | |
| June | 52.2 | 81.4 | 157.4 | |
| July | 21 | 33.8 | 58.5 | |
| August | 8.9 | 16.3 | 29.5 | |
| September | 8.2 | 15.4 | 34.2 | |
| October | 13.6 | 29 | 128.8 | |
| November | 41.2 | 212.2 | 1,092.5 | |
| December | 153.1 | 656.1 | 2,340.3 |
All values in cubic feet per second (cfs).
Common questions
- When does Marys River near Philomath, OR normally run highest?
- January, on the long-term record. The median daily flow that month is about 777.9 cfs, against 15.4 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 Marys River near Philomath, OR?
- It depends on the month. In January, half of days historically fall near 777.9 cfs, with the middle 80% of days between 253.7 and 2,553.5 cfs. The month-by-month table on this page gives the full range.
- How long has Marys River near Philomath, OR been measured?
- Discharge records at USGS site 14171000 begin in 1940, about 86 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 Marys River near Philomath, 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 Marys River near Philomath, OR?
- The gauge sits at 44.525, -123.334, in Oregon, in hydrologic subbasin 17090003, draining roughly 159 square miles.
- Can I use Marys River near Philomath, 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.