USGS Streamgage 12505450
Granger Drain at Granger, WA
Granger Drain at Granger, WA is USGS streamgage 12505450 in Washington, monitoring river discharge in hydrologic subbasin 17030003. Discharge records at this site go back to 1991. Typical flow runs near 49.7 cfs in July and 34.5 cfs in April, with the higher of the two arriving in July. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead.
View live conditions & forecast →
Gauge details
- State
- Washington
- Gauge elevation
- 727 ft
- Subbasin (HUC-8)
- 17030003
- Coordinates
- 46.34346, -120.18699
- USGS site number
- 12505450
- Records begin
- 1991-05-17 (35 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Granger Drain at Granger, 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 |
|---|---|---|---|---|
| 59 | 60.6 | 62.6 | ||
| 57.9 | 60.7 | 63.8 | ||
| 61.2 | 67.9 | 86.5 | ||
| 58.7 | 63.4 | 70.6 | ||
| 56.6 | 61.8 | 68.6 | ||
| 55.5 | 61.1 | 67.9 | ||
| 54.3 | 60.6 | 67.6 | ||
| 53.1 | 60 | 67.3 | ||
| 52.3 | 59.5 | 67 | ||
| 51.4 | 58.8 | 66.3 | ||
| 50.8 | 58.4 | 66 | ||
| 50.2 | 58.1 | 65.9 | ||
| 49.5 | 57.5 | 65.5 | ||
| 49.5 | 57.3 | 65.3 |
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 27 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 | 16.9 | 19.7 | 23.7 | |
| February | 16.3 | 19.5 | 23.5 | |
| March | 15.2 | 18.9 | 23.8 | |
| April | 26.6 | 34.5 | 41.7 | |
| May | 33.6 | 43.8 | 50.8 | |
| June | 36.4 | 47 | 54.5 | |
| July | 37.7 | 49.7 | 57.3 | |
| August | 41.8 | 52.4 | 59.3 | |
| September | 41.3 | 50.9 | 60.4 | |
| October | 29.3 | 41.3 | 51.2 | |
| November | 15.7 | 20.2 | 24.6 | |
| December | 15.9 | 19.6 | 22.8 |
All values in cubic feet per second (cfs).
Common questions
- When does Granger Drain at Granger, WA normally run highest?
- August, on the long-term record. The median daily flow that month is about 52.4 cfs, against 18.9 cfs in March, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Granger Drain at Granger, WA?
- It depends on the month. In January, half of days historically fall near 19.7 cfs, with the middle 80% of days between 16.9 and 23.7 cfs. The month-by-month table on this page gives the full range.
- How long has Granger Drain at Granger, WA been measured?
- Discharge records at USGS site 12505450 begin in 1991, about 35 years, covering roughly 8,446 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Granger Drain at Granger, 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. 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 Granger Drain at Granger, WA?
- The gauge sits at 46.34346, -120.18699, in Washington, in hydrologic subbasin 17030003, at an elevation of about 727 feet.
- Can I use Granger Drain at Granger, 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.