South Fork Stillaguamish River in Washington
Around here
Around South Fork Stillaguamish River
Data Source: Recreation.gov · Source: USGS GNIS · Public land: USGS PAD-US
About this river
South Fork Stillaguamish River is a 52.1 mile river. Streamflow is measured at the USGS gauge NF Stillaguamish River near Arlington, WA (site 12167000). The National Hydrography Dataset places it at stream order 7. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1928 to 2026
South Fork Stillaguamish River typically runs highest in December, at a median 2,100 cfs, and lowest in August, at 328 cfs. The highest flow on record for any single day is 36,800 cfs, in 2011.
Show the numbers
| Month | Typical (cfs) | Usual range (cfs) |
|---|---|---|
| January | 1,940 | 1,150 to 3,420 |
| February | 1,680 | 1,150 to 2,700 |
| March | 1,760 | 1,180 to 2,580 |
| April | 1,895 | 1,425 to 2,575 |
| May | 1,910 | 1,410 to 2,560 |
| June | 1,455 | 940 to 2,030 |
| July | 639 | 462 to 1,020 |
| August | 328 | 260 to 467 |
| September | 350 | 244 to 660 |
| October | 829 | 392 to 1,690 |
| November | 1,960 | 1,155 to 3,540 |
| December | 2,100 | 1,310 to 3,650 |
Typical is the median of each month’s daily median values, and the usual range runs from the median 25th to the median 75th percentile, across about 98 years of record. Statistics published by the US Geological Survey for NF Stillaguamish River near Arlington, WA (site 12167000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
3 mapped launches sit in the mapped area of South Fork Stillaguamish River, all of them public access. Ramp data comes from the USGS national boat-ramp inventory.
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show South Fork Stillaguamish River's live streamflow, water level and 7-day trend. It reads the USGS gauge directly, updates itself, and links back here.
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