About this river
Willamette River is a 25.1 mile river near Oregon Paddle Sports in Oregon. Streamflow is measured at the USGS gauge Willamette River at Harrisburg, OR (site 14166000). The National Hydrography Dataset places it at stream order 9. Reach geometry comes from the USGS National Hydrography Dataset.
Typical flow by month
1945 to 2026
Willamette River typically runs highest in January, at a median 16,200 cfs, and lowest in July, at 4,610 cfs. The highest flow on record for any single day is 173,000 cfs, in 1946.
| Month | Typical (cfs) | Usual range (cfs) | Relative level |
|---|---|---|---|
| January | 16,200 | 10,200 to 29,500 | |
| February | 11,800 | 7,870 to 19,300 | |
| March | 10,900 | 7,810 to 17,200 | |
| April | 10,450 | 7,935 to 15,150 | |
| May | 9,790 | 7,560 to 13,400 | |
| June | 6,970 | 5,435 to 9,770 | |
| July | 4,610 | 4,220 to 5,020 | |
| August | 4,870 | 4,370 to 5,370 | |
| September | 5,300 | 4,415 to 6,585 | |
| October | 6,340 | 5,010 to 7,630 | |
| November | 9,790 | 6,480 to 15,150 | |
| December | 15,200 | 8,280 to 28,100 |
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 81 years of record. Statistics published by the US Geological Survey for Willamette River at Harrisburg, OR (site 14166000). Conditions on any given day can fall well outside the usual range. Check the current reading before you go.
Embed this gauge on your site
Paste this snippet anywhere, an outfitter page, a club site, a trip report, to show Willamette 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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