USGS Streamgage 12155300
Pilchuck River near Snohomish, WA
Pilchuck River near Snohomish, WA is USGS streamgage 12155300 in Washington, monitoring river discharge in hydrologic subbasin 17110011. It drains a watershed of about 127 square miles. Discharge records at this site go back to 1992. Typical flow runs near 110.8 cfs in July and 489.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 127 sq mi
- Gauge elevation
- 52 ft
- Subbasin (HUC-8)
- 17110011
- Coordinates
- 47.93482, -122.07318
- USGS site number
- 12155300
- Records begin
- 1992-05-05 (34 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 34 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 | 291.7 | 709.6 | 1,921.9 | |
| February | 265 | 561.6 | 1,612.8 | |
| March | 278.8 | 588.7 | 1,439.5 | |
| April | 285.8 | 489.8 | 1,083.9 | |
| May | 155.5 | 319.2 | 792.7 | |
| June | 102.8 | 239.5 | 569.5 | |
| July | 65.9 | 110.8 | 252.1 | |
| August | 48 | 68 | 143.9 | |
| September | 48.1 | 73.1 | 263.8 | |
| October | 72.4 | 184.1 | 785.5 | |
| November | 179.2 | 533.2 | 1,709.7 | |
| December | 272.1 | 620.2 | 1,850 |
All values in cubic feet per second (cfs).