About this river
Columbia Slough is an 8.3 mile stream near Hayden Bay Marina in Oregon. Streamflow is measured at the USGS gauge Columbia Slough at Portland, OR (site 14211820). The National Hydrography Dataset places it at stream order 4. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1990 to 2026
Columbia Slough typically runs highest in January, at a median 151 cfs, and lowest in May, at 67 cfs. The highest flow on record for any single day is 2,400 cfs, in 1996.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 151 | 90 to 235 | |
| February | 150 | 83 to 223 | |
| March | 134 | 68 to 196 | |
| April | 108 | 38 to 180 | |
| May | 67 | -11 to 145 | |
| June | 88 | 15 to 158 | |
| July | 94 | 50 to 142 | |
| August | 78 | 35 to 122 | |
| September | 74 | 36 to 112 | |
| October | 90 | 46 to 132 | |
| November | 110 | 62 to 161 | |
| December | 128 | 73 to 203 |
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 35 years of record. Statistics published by the US Geological Survey for Columbia Slough at Portland, OR (site 14211820). 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 Columbia Slough, all of them public access. 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 Columbia Slough'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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