About this river
Snohomish River is a 3.9 mile river near Perfect Wave Sup & Kayak Rental in Washington. Streamflow is measured at the USGS gauge Snohomish River near Monroe, WA (site 12150800). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1963 to 2026
Snohomish River typically runs highest in May, at a median 12,400 cfs, and lowest in September, at 2,180 cfs. The highest flow on record for any single day is 132,000 cfs, in 1991.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 9,900 | 5,930 to 16,100 | |
| February | 7,910 | 5,850 to 12,100 | |
| March | 7,960 | 6,020 to 11,000 | |
| April | 9,385 | 7,295 to 12,500 | |
| May | 12,400 | 9,350 to 16,000 | |
| June | 10,550 | 7,820 to 15,250 | |
| July | 4,700 | 3,540 to 7,860 | |
| August | 2,200 | 1,780 to 3,050 | |
| September | 2,180 | 1,620 to 3,395 | |
| October | 4,050 | 2,400 to 6,990 | |
| November | 9,975 | 6,045 to 15,750 | |
| December | 9,440 | 6,470 to 15,600 |
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 63 years of record. Statistics published by the US Geological Survey for Snohomish River near Monroe, WA (site 12150800). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
One mapped launch sits in the mapped area of Snohomish River. Ramp data comes from the USGS national boat-ramp inventory.
- Cady ParkSnohomish RiverPublic
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Snohomish 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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