USGS Streamgage 12013500
Willapa River near Willapa, WA
Willapa River near Willapa, WA is USGS streamgage 12013500 in Washington, monitoring river discharge in hydrologic subbasin 17100106. It drains a watershed of about 130 square miles. Discharge records at this site go back to 1947. Typical flow runs near 64.7 cfs in July and 495.4 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 130 sq mi
- Gauge elevation
- 3 ft
- Subbasin (HUC-8)
- 17100106
- Coordinates
- 46.65093, -123.65266
- USGS site number
- 12013500
- Records begin
- 1947-08-26 (79 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 78 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 | 355.8 | 1,003 | 3,244.5 | |
| February | 336.7 | 811.2 | 2,620.3 | |
| March | 312.3 | 730.7 | 2,073.5 | |
| April | 252.1 | 495.4 | 1,192.8 | |
| May | 128.4 | 247 | 558.2 | |
| June | 71.4 | 125.7 | 315.6 | |
| July | 37.9 | 64.7 | 112.9 | |
| August | 21.6 | 36 | 74.7 | |
| September | 22.4 | 38.3 | 150.4 | |
| October | 34.9 | 132.4 | 723.2 | |
| November | 165 | 696.1 | 2,393.3 | |
| December | 348.5 | 1,020.5 | 3,300.3 |
All values in cubic feet per second (cfs).