USGS Streamgage 12037400
Wynoochee River above Black Creek near Montesano, WA
Wynoochee River above Black Creek near Montesano, WA is USGS streamgage 12037400 in Washington, monitoring river discharge in hydrologic subbasin 17100104. It sits on the Wynoochee River, alongside 2 other gauges Rivermatics tracks on the same river. It drains a watershed of about 155 square miles. Discharge records at this site go back to 1956. Typical flow runs near 289.5 cfs in July and 796.3 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
- 39 ft
- Subbasin (HUC-8)
- 17100104
- Coordinates
- 47.01148, -123.65544
- USGS site number
- 12037400
- Records begin
- 1956-10-01 (70 years)
- Rivermatics forecast
- 14-day flow outlook
14-day flow forecast
Based on observations through for Wynoochee River above Black Creek near Montesano, 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 |
|---|---|---|---|---|
| 182 | 186 | 191 | ||
| 181 | 189 | 218 | ||
| 187 | 211 | 304 | ||
| 185 | 211 | 310 | ||
| 180 | 199 | 280 | ||
| 175 | 191 | 258 | ||
| 172 | 187 | 250 | ||
| 169 | 184 | 244 | ||
| 168 | 182 | 247 | ||
| 167 | 182 | 258 | ||
| 165 | 181 | 263 | ||
| 164 | 180 | 256 | ||
| 162 | 179 | 264 | ||
| 161 | 179 | 283 |
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 54 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 | 717.5 | 1,984.5 | 5,589.4 | |
| February | 647.1 | 1,444.5 | 4,314.5 | |
| March | 572.6 | 1,259 | 3,409 | |
| April | 473 | 796.3 | 1,980.7 | |
| May | 329.1 | 534.3 | 1,195 | |
| June | 255.9 | 405.1 | 890.2 | |
| July | 198.7 | 289.5 | 454.5 | |
| August | 161.3 | 212.6 | 320.2 | |
| September | 158.9 | 253.8 | 719 | |
| October | 174.8 | 498.3 | 2,175.5 | |
| November | 473 | 1,643.3 | 5,198 | |
| December | 700.6 | 1,927.7 | 6,119.7 |
All values in cubic feet per second (cfs).
Common questions
- When does Wynoochee River above Black Creek near Montesano, WA normally run highest?
- January, on the long-term record. The median daily flow that month is about 1,984.5 cfs, against 212.6 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
- What is a normal flow for Wynoochee River above Black Creek near Montesano, WA?
- It depends on the month. In January, half of days historically fall near 1,984.5 cfs, with the middle 80% of days between 717.5 and 5,589.4 cfs. The month-by-month table on this page gives the full range.
- How long has Wynoochee River above Black Creek near Montesano, WA been measured?
- Discharge records at USGS site 12037400 begin in 1956, about 70 years, covering roughly 8,835 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
- Is there a flow forecast for Wynoochee River above Black Creek near Montesano, 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 Wynoochee River above Black Creek near Montesano, WA?
- The gauge sits at 47.01148, -123.65544, in Washington, in hydrologic subbasin 17100104, at an elevation of about 39 feet, draining roughly 155 square miles.
- Can I use Wynoochee River above Black Creek near Montesano, 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.
Upstream and downstream on the Wynoochee River
Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Wynoochee River in full.
- Wynoochee River near Grisdale, WA 41 sq mi
- Wynoochee River above Save Creek near Aberdeen, WA 74 sq mi
- Wynoochee River above Black Creek near Montesano, WA this page