USGS Streamgage 12161000
SF Stillaguamish River near Granite Falls, WA
SF Stillaguamish River near Granite Falls, WA is USGS streamgage 12161000 in Washington, monitoring river discharge in hydrologic subbasin 17110008. It drains a watershed of about 119 square miles. Discharge records at this site go back to 1928. Typical flow runs near 471.3 cfs in July and 994.3 cfs in April, with the higher of the two arriving in April.
Gauge details
- State
- Washington
- Drainage area
- 119 sq mi
- Gauge elevation
- 339 ft
- Subbasin (HUC-8)
- 17110008
- Coordinates
- 48.10369, -121.94567
- USGS site number
- 12161000
- Records begin
- 1928-08-01 (98 years)
Typical flow by month
Long-term daily discharge percentiles from the USGS record (up to 53 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 | 275.9 | 778.7 | 3,441.3 | |
| February | 303 | 755.7 | 2,628.3 | |
| March | 390.7 | 779.1 | 2,162.9 | |
| April | 585 | 994.3 | 2,012.7 | |
| May | 695.8 | 1,212.6 | 2,220.6 | |
| June | 498.1 | 1,001.5 | 1,975 | |
| July | 210.6 | 471.3 | 1,150.4 | |
| August | 104 | 205.2 | 612.9 | |
| September | 101.8 | 230.6 | 1,216.3 | |
| October | 161 | 541 | 2,481.3 | |
| November | 307.9 | 910.3 | 3,152.7 | |
| December | 407.1 | 1,070.3 | 3,771.3 |
All values in cubic feet per second (cfs).