About this river
Tualatin River is a 14.5 mile river near Riverplace Marina in Oregon. Streamflow is measured at the USGS gauge Tualatin River at West Linn, OR (site 14207500). The National Hydrography Dataset places it at stream order 8. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1929 to 2025
Tualatin River typically runs highest in January, at a median 3,390 cfs, and lowest in August, at 80 cfs. The highest flow on record for any single day is 25,900 cfs, in 1996.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 3,390 | 1,690 to 5,320 | |
| February | 2,970 | 1,610 to 4,830 | |
| March | 2,340 | 1,290 to 3,850 | |
| April | 1,250 | 912 to 2,175 | |
| May | 530 | 393 to 803 | |
| June | 272 | 202 to 404 | |
| July | 133 | 44 to 222 | |
| August | 80 | 13 to 196 | |
| September | 111 | 20 to 235 | |
| October | 159 | 66 to 286 | |
| November | 623 | 277 to 1,350 | |
| December | 2,130 | 913 to 4,520 |
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 96 years of record. Statistics published by the US Geological Survey for Tualatin River at West Linn, OR (site 14207500). 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 Tualatin River, 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 Tualatin 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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