Willamette River at Portland streamflow

Daily mean discharge, Willamette-Columbia basin, Oregon

Data through Aug 12, 2026 · source last checked Aug 13, 2026 · page revised Aug 13, 2026

Cite

Willamette River at Portland: 4,930 cfs daily mean discharge as of Aug 12, 2026 (USGS). The Waterline. https://the-waterline.com/streamflow/willamette-river-at-portland

cfs

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<a href="https://the-waterline.com/streamflow/willamette-river-at-portland?utm_source=embed&utm_medium=chart">
  <img src="https://the-waterline.com/charts/streamflow/willamette-river-at-portland/chart.png" alt="Willamette River at Portland streamflow — Aug 12, 2026" width="720" style="max-width:100%;height:auto;border:0"/>
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<p style="font-size:12px;margin:4px 0 0">Source: <a href="https://the-waterline.com/streamflow/willamette-river-at-portland?utm_source=embed&utm_medium=credit">The Waterline</a> · updates automatically</p>
<p style="font-size:11px;color:#6b6b6b;margin:2px 0 0">About this data: US Geological Survey (USGS) · Daily mean streamflow (discharge) · Willamette River at Portland · cfs · Daily mean · through Aug 12, 2026</p>

Free to republish with attribution. The chart updates automatically as new data lands.

About this data

Source: US Geological Survey (USGS)
Series: Daily mean streamflow (discharge)
Geography: Willamette River at Portland
Unit: cfs
Calculation: Daily mean
Last observation: Aug 12, 2026
Update frequency: Daily

Now 4,930 cfs, 21% below the 5-yr median.

Willamette streamflow at Portland fell to 5,680 cfs, down 15% on the month and 10% below the 5-year median. Week-over-week the gauge rose 4.6%, though month-over-month declines persist.

The numbers
Period	Current	Prior	Change
Week over week	4,930 cfs	5,310 cfs	-7.2%
Month over month	4,930 cfs	7,310 cfs	-32.6%
Year over year	4,930 cfs	5,890 cfs	-16.3%
vs 5-yr median	4,930 cfs	6,220 cfs	-20.7%

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