USGS Streamgage 12025000
Newaukum River near Chehalis, WA
Newaukum River near Chehalis, WA is USGS streamgage 12025000 in Washington, monitoring river discharge in hydrologic subbasin 17100103. It drains a watershed of about 155 square miles. Discharge records at this site go back to 1929. Typical flow runs near 77.2 cfs in July and 455 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.
View live conditions & forecast →
Gauge details
- State
- Washington
- Drainage area
- 155 sq mi
- Gauge elevation
- 198 ft
- Subbasin (HUC-8)
- 17100103
- Coordinates
- 46.6201, -122.94513
- USGS site number
- 12025000
- Records begin
- 1929-03-01 (97 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Newaukum River near Chehalis, 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 |
|---|---|---|---|---|
| 33.9 | 35.3 | 36.6 | ||
| 33.5 | 36 | 40.1 | ||
| 39.8 | 54.5 | 92.3 | ||
| 44.5 | 65.2 | 110 | ||
| 40.2 | 52.2 | 74.8 | ||
| 36.6 | 44.6 | 58.4 | ||
| 34.2 | 40.4 | 50.5 | ||
| 32.7 | 38 | 46.1 | ||
| 31.7 | 36.7 | 44.1 | ||
| 31 | 36 | 42.9 | ||
| 30.1 | 34.9 | 41.4 | ||
| 29.4 | 34.1 | 40.3 | ||
| 28.6 | 33.3 | 39.4 | ||
| 28.2 | 32.8 | 38.8 |
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 97 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 | 301.7 | 783.3 | 2,339.4 | |
| February | 312.2 | 697.6 | 1,912.8 | |
| March | 293.4 | 625.1 | 1,481.3 | |
| April | 242.6 | 455 | 1,016.8 | |
| May | 135.7 | 241.7 | 565.2 | |
| June | 80.7 | 144.7 | 358.2 | |
| July | 46.1 | 77.2 | 143.7 | |
| August | 30.4 | 47.7 | 82.4 | |
| September | 29.9 | 46.7 | 128.2 | |
| October | 41.5 | 98.3 | 418.9 | |
| November | 120.1 | 500.4 | 1,745 | |
| December | 265.8 | 756.7 | 2,277.4 |
All values in cubic feet per second (cfs).
Common questions
- When does Newaukum River near Chehalis, WA normally run highest?
- January, on the long-term record. The median daily flow that month is about 783.3 cfs, against 46.7 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 Newaukum River near Chehalis, WA?
- It depends on the month. In January, half of days historically fall near 783.3 cfs, with the middle 80% of days between 301.7 and 2,339.4 cfs. The month-by-month table on this page gives the full range.
- How long has Newaukum River near Chehalis, WA been measured?
- Discharge records at USGS site 12025000 begin in 1929, about 97 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 Newaukum River near Chehalis, 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 Newaukum River near Chehalis, WA?
- The gauge sits at 46.6201, -122.94513, in Washington, in hydrologic subbasin 17100103, at an elevation of about 198 feet, draining roughly 155 square miles.
- Can I use Newaukum River near Chehalis, 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.