About this river
North Fork Siuslaw River is a 4.5 mile river near Siltcoos River Kayak Rentals in Oregon. Streamflow is measured at the USGS gauge Siuslaw River near Mapleton, OR (site 14307620). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1968 to 2026
North Fork Siuslaw River typically runs highest in January, at a median 3,100 cfs, and lowest in September, at 113 cfs. The highest flow on record for any single day is 45,900 cfs, in 1974.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 3,100 | 1,810 to 5,760 | |
| February | 2,670 | 1,500 to 4,570 | |
| March | 2,440 | 1,710 to 4,300 | |
| April | 1,870 | 1,215 to 2,765 | |
| May | 865 | 611 to 1,310 | |
| June | 485 | 378 to 664 | |
| July | 231 | 184 to 294 | |
| August | 132 | 104 to 169 | |
| September | 113 | 87 to 153 | |
| October | 165 | 109 to 247 | |
| November | 925 | 439 to 2,595 | |
| December | 2,740 | 1,430 to 6,330 |
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 52 years of record. Statistics published by the US Geological Survey for Siuslaw River near Mapleton, OR (site 14307620). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Boat access nearby
4 mapped launches sit in the mapped area of North Fork Siuslaw River. Ramp data comes from the USGS national boat-ramp inventory.
- Siuslaw River RV Park & MarinaSiuslaw RiverRestricted
- Bender LandingSiuslaw RiverPublic
- TiernanSiuslaw RiverPublic
- Houghton Landing County ParkSiuslaw River, North ForkPublic
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Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show North Fork Siuslaw 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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