About this river
Nehalem River is an 11.3 mile river near St. Helens Marina in Oregon. Streamflow is measured at the USGS gauge Nehalem River near Vernonia, OR (site 14299800). The National Hydrography Dataset places it at stream order 6. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
2002 to 2025
Nehalem River typically runs highest in January, at a median 420 cfs, and lowest in September, at 6.2 cfs. The highest flow on record for any single day is 10,700 cfs, in 2008.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 420 | 269 to 859 | |
| February | 306 | 178 to 488 | |
| March | 313 | 202 to 559 | |
| April | 220 | 127 to 328 | |
| May | 88 | 53 to 117 | |
| June | 35 | 27 to 49 | |
| July | 14 | 11 to 20 | |
| August | 7.1 | 4.5 to 10 | |
| September | 6.2 | 4.3 to 8.3 | |
| October | 15 | 8.3 to 24 | |
| November | 124 | 46 to 372 | |
| December | 378 | 161 to 740 |
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 23 years of record. Statistics published by the US Geological Survey for Nehalem River near Vernonia, OR (site 14299800). 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 Nehalem River. Ramp data comes from the USGS national boat-ramp inventory.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Nehalem 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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