USGS Streamgage 12155500
Snohomish River at Snohomish, WA
Snohomish River at Snohomish, WA is USGS streamgage 12155500 in Washington, monitoring river discharge in hydrologic subbasin 17110011. It drains a watershed of about 1,714 square miles. Discharge records at this site go back to 1906. Typical flow runs near 12,764.7 cfs in July and 17,220.8 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 1,714 sq mi
- Gauge elevation
- 7 ft
- Subbasin (HUC-8)
- 17110011
- Coordinates
- 47.911, -122.09875
- USGS site number
- 12155500
- Records begin
- 1906-01-01 (120 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 1 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.
Only 9 of 12 months have enough record to summarize; the rest are omitted.
| Month | Low p10 | Typical p50 | High p90 | Range |
|---|---|---|---|---|
| January | — | 20,307.7 | — | |
| March | — | 14,758.8 | — | |
| April | — | 17,220.8 | — | |
| May | — | 17,160 | — | |
| June | — | 15,200 | — | |
| July | — | 12,764.7 | — | |
| October | — | 11,675 | — | |
| November | — | 15,146.2 | — | |
| December | — | 16,572.7 | — |
All values in cubic feet per second (cfs).