Streamflow
Near normalColumbia River at The Dalles streamflow
Daily mean discharge, Columbia basin, Oregon
Data through Sep 29, 2026 · source last checked Oct 1, 2026 · page revised Oct 1, 2026
Cite
- Discharge
About this data
- Source
- US Geological Survey (USGS)
- Series
- Daily mean streamflow (discharge)
- Geography
- Columbia River at The Dalles
- Unit
- cfs
- Calculation
- Daily mean
- Last observation
- Sep 29, 2026
- Update frequency
- Daily
Now 90,800 cfs, 1% below the 5-yr median.
Discharge at The Dalles reached 90,800 cfs, up 9.7% from a week earlier. The gauge is 1% below the 5-yr median. Year-over-year flow is up 12.2%.
| Period | Current | Prior | Change |
|---|---|---|---|
| Week over week | 90,800 cfs | 82,800 cfs | +9.7% |
| Month over month | 90,800 cfs | 90,400 cfs | +0.4% |
| Year over year | 90,800 cfs | 80,900 cfs | +12.2% |
| vs 5-yr median | 90,800 cfs | 91,700 cfs | -1.0% |
| Reading | Discharge |
|---|---|
| Lowest on record for this week | 78,700 cfs |
| Median for this week | 91,700 cfs |
| Highest on record for this week | 109,000 cfs |
Previous weeks
Week of Sep 23, 2026
Discharge at The Dalles was 79,100 cfs, down 36.2% from a month earlier. Week over week flow declined 4.2%. The gauge sits 16% below the 5-yr median.
Week of Sep 15, 2026
Columbia River discharge at The Dalles is 79,100 cfs, down 8.3% from the prior week. Current flow is 19% below the 5-year median. Flow has declined 39.2% since the prior month.
Week of Sep 2, 2026
Discharge at The Dalles fell to 109,000 cfs, down 26.8% on the week. Flow is running 3% above the 5-year median.
Week of Aug 26, 2026
Columbia River discharge at The Dalles is running at 149,000 cfs, 21% above the 5-year median. Flow rose 16.4% week over week and 30.7% month over month, tracking 21.1% above year-ago levels.
About Columbia River at The Dalles
USGS gage 14105700 measures the Columbia River at The Dalles, Oregon, below the confluence of the Snake and above Bonneville Dam. It integrates roughly 237,000 square miles of drainage across seven states and British Columbia, which makes it the standard index of the entire Columbia basin's water year: the January-to-July volume at The Dalles is the number the region's runoff forecasts are quoted in.
A normal year rises through the spring as the interior snowpack melts, peaks in late May or June, and recedes through the summer, with the shape smoothed by the treaty and federal storage projects upstream. Because so much of the basin is regulated, the peak here is lower and later than the natural one would be. The reading carries beyond water supply: Columbia flow at this reach sets hydropower output across the Pacific Northwest and drives the spill and flow targets that govern juvenile salmon migration through the lower river.