USGS Streamgage 12150800
Snohomish River near Monroe, WA
Snohomish River near Monroe, WA is USGS streamgage 12150800 in Washington, monitoring river discharge in hydrologic subbasin 17110011. It drains a watershed of about 1,537 square miles. Discharge records at this site go back to 1963. Typical flow runs near 4,907.4 cfs in July and 9,470 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 1,537 sq mi
- Gauge elevation
- 16 ft
- Subbasin (HUC-8)
- 17110011
- Coordinates
- 47.83093, -122.04846
- USGS site number
- 12150800
- Records begin
- 1963-02-01 (63 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 63 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 | 4,588.4 | 9,730.6 | 27,477.4 | |
| February | 4,436.2 | 8,170.3 | 21,496.6 | |
| March | 4,669.4 | 8,007.1 | 16,754.8 | |
| April | 5,988.7 | 9,470 | 16,946.7 | |
| May | 7,673.2 | 12,003.2 | 20,529 | |
| June | 5,833 | 10,857.3 | 20,063.3 | |
| July | 2,806.8 | 4,907.4 | 12,186.1 | |
| August | 1,579.4 | 2,268.4 | 5,302.6 | |
| September | 1,344.7 | 2,192.3 | 6,093.3 | |
| October | 1,705.5 | 4,334.5 | 13,969 | |
| November | 3,964 | 9,817 | 27,236.7 | |
| December | 4,580.3 | 9,491.6 | 25,780.6 |
All values in cubic feet per second (cfs).